You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.

Ex Input:
Paragraph- Sent 1: Paul put the despised watch away And laid out before him his array Of stones and metals, and when the morning Struck the stones to their best adorning, He chose the brightest, and this new watch Was so light and thin it seemed to catch The sunlight's nothingness, and its gleam.
Sent 2: Topazes ran in a foamy stream Over the cover, the hands were studded With garnets, and seemed red roses, budded.
Sent 3: The face was of crystal, and engraved Upon it the figures flashed and waved With zircons, and beryls, and amethysts.
Sent 4: It took a week to make, and his trysts At night with the Shadow were his alone.
Sent 5: Paul swore not to speak till his task was done.
Sent 6: The night that the jewel was worthy to give.
Sent 7: Paul watched the long hours of daylight live To the faintest streak; then lit his light, And sharp against the wall's pure white The outline of the Shadow started Into form.
Sent 8: His burning-hearted Words so long imprisoned swelled To tumbling speech.
Sent 9: Like one compelled, He told the lady all his love, And holding out the watch above His head, he knelt, imploring some Littlest sign.
Sent 10: The Shadow was dumb.
Question: What were the hands of the watch studded with? (A) Garnets (B) Garnets and seemed budded roses (C) Topazes (D) Zircons.

Ex Output:
A, B.

Ex Input:
Paragraph- Sent 1: When land is cleared, habitats are lost.
Sent 2: It may be cleared for agriculture.
Sent 3: It may also be used for building new homes or businesses.
Sent 4: Within the past 100 years, the amount of land used for agriculture has almost doubled.
Sent 5: Land used for grazing cattle has more than doubled.
Sent 6: Many wetlands have also been lost to agriculture.
Sent 7: The U.S. has lost almost all the natural tall-grass prairies.
Sent 8: Thee areas of tall thick grass have virtually disappeared.
Sent 9: These areas of land had thick fertile soil.
Sent 10: Their grasses had very deep root systems.
Sent 11: These deep and thick roots reduced the amount of soil erosion.
Sent 12: They also were home to many plants and animals.
Sent 13: Prairies were wonderful places.
Sent 14: They were home to colorful flowers, prairie dogs, and herds of bison.
Question: What reduced the amount of soil erosion in grass? (A) Deep and thick roots (B) Deep roots (C) Shallow roots (D) The prarie dogs (E) Animals (F) The deep root system of grass (G) The grasses with deep root systems.

Ex Output:
A, B, F, G.

Ex Input:
Paragraph- Sent 1: The inhabited history of the Las Vegas Valley stretches to 23,000 b.c.
Sent 2: , when much of the area was covered by a prehistoric lake.
Sent 3: During this period, the indigenous people lived in caves, hunting the mammals that gathered at the shoreline.
Sent 4: The landscape of the valley changed dramatically over the next 200 centuries.
Sent 5: The glaciers feeding the lake melted away and the lake evaporated.
Sent 6: Fossils tell an obscure story of man's slow and sporadic development.
Sent 7: Around 3000 b.c.
Sent 8: , native Archaic Indians began to develop a lasting hunting and gathering culture.
Sent 9: By this time, the valley was in much the same geographic state as it exists in today, with one exceptionthe presence of artesian springs that bubbled to the surface in several areas.
Sent 10: These springs fed a network of streams draining through the Las Vegas Wash to the Colorado River.
Sent 11: The areas surrounding the springs were desert oases: sprawling collections of grasses, trees, and wildlife.
Sent 12: Many springs lay in areas that would eventually become the center of the modern Las Vegas metropolis.
Sent 13: For about 4000 years, the Archaics thrived in a culture that included many signs of early civilization.
Sent 14: Signs of even more advancement appeared halfway through the first millennium a.d.
Sent 15: , when the Anasazi Indians inhabited the valley.
Sent 16: Far more progressive than the Archaics, the Anasazi utilized such formal agricultural techniques as irrigation to assist their harvest.
Sent 17: This permitted the Anasazi to achieve a benchmark of advanced societythe ability to live in permanent shelters year-round without need to follow wildlife.
Sent 18: Mysteriously, the Anasazi vanished from the valley around a.d.
Question: Where did the indigenous people of Las Vegas hunted? (A) By the shoreline of the lake (B) In the desert (C) On the plateaus (D) Mammals that gathered at the shoreline (E) In caves (F) At the shoreline (G) At Las Vegas Wash.

Ex Output:
A, D, F.