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').
--------
Question: 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

Answer: a


Question: Giraffes sleep less than ____ hours a day.\Question: Choose the right answer from options given a) two b) six c) seven d) ten

Answer: a


Question: China is located in eastern Asia and spans more than ____ million square kilometers.\Question: Choose the right answer from options given a) nine b) no c) five d) seven

Answer:
a