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: Sea stars have ____ arms, or rays, connected to a small round body.\Question: Choose the right answer from options given a) five b) six c) seven d) no
Example Output: a

Example Input: Lynx consume one or ____ hares a day.\Question: Choose the right answer from options given a) five b) no c) two d) three
Example Output: c

Example Input: Volcanic islands move through ____ stages of growth and erosion.\Question: Choose the right answer from options given a) eight b) two c) seven d) one
Example Output:
a