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').

Input: Consider Input: Perennial grass takes three to ____ years before it is mature enough to produce adequate seed.\Question: Choose the right answer from options given a) five b) seven c) six d) four

Output: a


Input: Consider Input: Alleles fall into ____ classes based on somatic, gonadal and dauer phenotypes.\Question: Choose the right answer from options given a) ten b) six c) eight d) no

Output: b


Input: Consider Input: Black people are ____ times less likely to be employed than whites with similar qualifications.\Question: Choose the right answer from options given a) four b) three c) ten d) one


Output: b