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.

Input: Consider Input: Paragraph- Sent 1: Fossils can be used to match up rock layers.
Sent 2: As organisms change over time, they look different.
Sent 3: Older fossils will look different than younger fossils.
Sent 4: Some organisms only survived for a short time before going extinct.
Sent 5: Knowing what organisms looked like at certain times also helps date rock layers.
Sent 6: Some fossils are better than others for this use.
Sent 7: The fossils that are very distinct at certain times of Earths history are called index fossils.
Sent 8: Index fossils are commonly used to match rock layers.
Sent 9: You can see how this works in Figure 2.30.
Sent 10: If two rock layers have the same index fossils, then they're probably about the same age.
Question: How are index fossils useful? (A) They show us flora of the past (B) Knowing what organisms looked like at certain times also helps date rock layers, and index fossils are the fossils that are very distinct at certain times of Earth's history (C) The fossils that are very distinct at certain times of Earths history and help date fossils (D) For fuel (E) They help to determineage of rock layers (F) They are used to mark water levels (G) They are used to identify extinct animals (H) As markers for glacier activity.

Output: B, C, E.

Input: Consider Input: Paragraph- Sent 1: Cavour was a younger son of a noble Piedmontese family, and entered the army in 1826, serving in the engineers.
Sent 2: His liberal sentiments made him distrusted by the government of Charles Felix as a dangerous man, and he was doomed to an inactive life in an unimportant post.
Sent 3: He soon quitted the army, and embarked in business operations as manager of one of the estates of his family.
Sent 4: For twelve years he confined himself to agricultural labors, making himself acquainted with all the details of business and with the science of agriculture, introducing such improvements as the use of guano, and promoting agricultural associations; but he was not indifferent at the same time to public affairs, being one of the most zealous advocates of constitutional liberty.
Sent 5: A residence in England gave him much valuable knowledge as to the working of representative institutions.
Sent 6: He established in 1847 a political newspaper, and went into parliament as a member of the Chamber of Deputies.
Sent 7: In 1848 he used all his influence to induce the government to make war with Austria; and when Charles Albert abdicated, and Victor Emmanuel became king, Cavour's great talents were rewarded.
Sent 8: In 1850 he became minister of commerce; in 1852, prime minister.
Sent 9: After that, his history is the history of Italy itself.
Question: Cavour worked in agriculture after doing what for his family? (A) After embarking in business operations (B) He became the manager of one of his family's estates (C) Growing crops (D) Working "in business operations as manager of one of the estates of his family" (E) He became the head of his family (F) After serving in the engineers.

Output: B, D.

Input: Consider Input: Paragraph- Sent 1: Earth processes have not changed over time.
Sent 2: The way things happen now is the same way things happened in the past.
Sent 3: Mountains grow and mountains slowly wear away.
Sent 4: The same process is at work the same as it was billions of years ago.
Sent 5: As the environment changes, living creatures adapt.
Sent 6: They change over time.
Sent 7: Some organisms may not be able to adapt.
Sent 8: They become extinct.
Sent 9: Becoming extinct means they die out completely.
Sent 10: Some geologists study the history of the Earth.
Sent 11: They want to learn about Earths past.
Sent 12: They use clues from rocks and fossils.
Sent 13: They use these clues to make sense of events.
Sent 14: The goal is to place things in the order they happened.
Sent 15: They also want to know how long it took for those events to happen.
Question: What are the goals of geologists? (A) To place things in the order they happened (B) The goal is to place things in the order they happened (C) Make lots of money (D) To know how long it took for those events to happen (E) Make money (F) Learn about eath's past (G) Earth processes (H) Learn from the past.
Output: A, B, D, F, H.