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]: Sea stars have ____ arms, or rays, connected to a small round body.\Question: Choose the right answer from options given a) five b) six c) seven d) no
[EX A]: a

[EX Q]: Granite occurs in ____ separate masses.\Question: Choose the right answer from options given a) two b) eight c) nine d) no
[EX A]: a

[EX Q]: Homozygosity is achieved by crossing ____ hemizygous animals.\Question: Choose the right answer from options given a) five b) four c) zero d) two
[EX A]:
d