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]: Breast cancer strikes one out of every ____ American women.\Question: Choose the right answer from options given a) one b) nine c) no d) six
[EX A]: b

[EX Q]: Rapid growth occurs for the first ____ years of life.\Question: Choose the right answer from options given a) eight b) ten c) three d) five
[EX A]: d

[EX Q]: Primary succession is succession in an area where ____ previous organisms existed.\Question: Choose the right answer from options given a) one b) no c) three d) seven
[EX A]:
b