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').

[EX Q]: Many tractors have ____ wheel drive to get extra grip on the hills and in wet conditions.\Question: Choose the right answer from options given a) four b) seven c) five d) two
[EX A]: a

[EX Q]: Birds reach sexual maturity in three to ____ years.\Question: Choose the right answer from options given a) seven b) two c) five d) six
[EX A]: c

[EX Q]: Cockscombs come in ____ different shapes.\Question: Choose the right answer from options given a) eight b) two c) four d) nine
[EX A]:
b