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').

Bees possess ____ eyes.\Question: Choose the right answer from options given a) three b) five c) one d) ten
b

Female bilbies have a backward-opening pouch with ____ nipples.\Question: Choose the right answer from options given a) no b) two c) five d) eight
d

Brain development is very dramatic in the first ____ years of life.\Question: Choose the right answer from options given a) three b) six c) zero d) five

a