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').

Q: Ascidian tunicates come in ____ main forms.\Question: Choose the right answer from options given a) three b) zero c) four d) eight

A: a
****
Q: China is reportedly in the top ____ nations in industrial output.\Question: Choose the right answer from options given a) seven b) ten c) three d) five

A: b
****
Q: Drakes are usually between the size of a small pony to the size of ____ oxen or yak.\Question: Choose the right answer from options given a) one b) three c) four d) eight

A:
c
****