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: Collars come in ____ shapes.\Question: Choose the right answer from options given a) six b) two c) four d) zero

A: b
****
Q: Indian reservations are part of five of the nation's ____ poorest counties.\Question: Choose the right answer from options given a) seven b) nine c) ten d) two

A: c
****
Q: Children usually outgrow food allergies by the time they are ____ years of age.\Question: Choose the right answer from options given a) no b) zero c) five d) ten

A:
c
****