Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').
--------
Question: All quetzals have ____ legs.\Question: Choose the right answer from options given a) four b) zero c) eight d) ten

Answer: a

Question: Most roots require from ____ to six weeks to dry sufficiently to be safe.\Question: Choose the right answer from options given a) two b) four c) eight d) three

Answer: d

Question: Cuboids have ____ faces, which form a convex polyhedron.\Question: Choose the right answer from options given a) nine b) no c) ten d) six

Answer:
d