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').

TriMetal Irons Discover the benefits of ____ different metals.\Question: Choose the right answer from options given a) five b) seven c) no d) three
d

Living cells have at least ____ parts.\Question: Choose the right answer from options given a) seven b) three c) zero d) four
b

Crawlers are minute, orange-yellow and oval, with ____ legs and one pair of antennae.\Question: Choose the right answer from options given a) one b) two c) six d) ten

c