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: Stringers consist of ____ narrow pieces of wood glued together.\Question: Choose the right answer from options given a) ten b) three c) five d) seven
Example Output: b

Example Input: Condors become sexually mature at about five or ____ years of age and mate for life.\Question: Choose the right answer from options given a) nine b) seven c) one d) six
Example Output: d

Example Input: Commas signal the breaks between ____ or more units in a series.\Question: Choose the right answer from options given a) three b) zero c) one d) ten
Example Output:
a