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: Songbirds have ____ sets of vocal chords.\Question: Choose the right answer from options given a) six b) two c) eight d) ten

Output: b

Input: Consider Input: Young children suffer from an average of six to ____ colds a year.\Question: Choose the right answer from options given a) ten b) eight c) two d) one

Output: b

Input: Consider Input: All earwigs have ____ body parts , head , thorax , and abdomen .\Question: Choose the right answer from options given a) three b) ten c) no d) six
Output: a