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').

[EX Q]: Calves remain hidden for much of the time, and are weaned by ____ months of age.\Question: Choose the right answer from options given a) six b) three c) eight d) one
[EX A]: b

[EX Q]: Hypertension affects nearly one in ____ adults.\Question: Choose the right answer from options given a) three b) seven c) five d) zero
[EX A]: a

[EX Q]: Brazil has ten million rural poor who have ____ access to land.\Question: Choose the right answer from options given a) eight b) no c) three d) nine
[EX A]:
b