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').

Example input: Female snakes incubate eggs inside of their bodies, giving birth to live young of ____ or more. \Question: Choose the right answer from the options given a) five b) zero c) seven d) ten
Example output: d
Example explanation: Snakes give birth to minimum ten young ones so ten is a correct answer.
Q: Perennials can take three or ____ years to reach a mature size.\Question: Choose the right answer from options given a) three b) one c) four d) ten
A:
c