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').

Chemistry has ____ less important names.\Question: Choose the right answer from options given a) ten b) no c) eight d) nine
b

Today there are ____ federal states, each based on cultural affiliations.\Question: Choose the right answer from options given a) one b) nine c) seven d) zero
b

Coral larvae are formed in ____ different ways.\Question: Choose the right answer from options given a) two b) three c) one d) zero

a