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]: Some families have two daddies or ____ mommies.\Question: Choose the right answer from options given a) nine b) seven c) zero d) two
[A]: d


[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
[A]: a


[Q]: Medial moraines are formed when ____ glaciers meet.\Question: Choose the right answer from options given a) zero b) three c) two d) nine
[A]:
c