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').

Grasshoppers can fly at speeds up to ____ miles per hour.\Question: Choose the right answer from options given a) eight b) seven c) two d) nine
a

Brachiopods are superficially similar to bivalves, both having ____ shells.\Question: Choose the right answer from options given a) two b) eight c) seven d) one
a

Caterpillars grow rapidly and typically complete their larval development in ____ to eight weeks.\Question: Choose the right answer from options given a) seven b) ten c) five d) three
a