TASK DEFINITION: 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').
PROBLEM: Butterflies have ____ stages in their life cycle.\Question: Choose the right answer from options given a) two b) four c) no d) eight

SOLUTION: b

PROBLEM: Whales are divided into ____ categories, based on their teeth.\Question: Choose the right answer from options given a) two b) four c) nine d) ten

SOLUTION: a

PROBLEM: Female gorillas give birth to ____ infant after a pregnancy of nearly nine months.\Question: Choose the right answer from options given a) four b) one c) three d) seven

SOLUTION:
b