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]: Cattails contain ____ times the starch of an equal weight fo potatoes.\Question: Choose the right answer from options given a) six b) ten c) eight d) two
[EX A]: b

[EX Q]: Elephants give birth to ____ calf every four to nine years on average.\Question: Choose the right answer from options given a) ten b) one c) eight d) six
[EX A]: b

[EX Q]: Female nymphs have ____ instars.\Question: Choose the right answer from options given a) nine b) one c) four d) six
[EX A]:
c