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]: Potential energy is divided into ____ different types of energy.\Question: Choose the right answer from options given a) eight b) three c) zero d) two
[A]: b


[Q]: Cows breed at ____ years, bulls at four.\Question: Choose the right answer from options given a) two b) three c) seven d) one
[A]: b


[Q]: Dragonflies There are ____ species of dragonflies in New Zealand.\Question: Choose the right answer from options given a) seven b) one c) five d) two
[A]:
a