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: Decapod crustaceans have ____ pairs of limbs.\Question: Choose the right answer from options given a) five b) four c) six d) seven
Example Output: a

Example Input: Influenza epidemics are ____ times more likely during solar maxima.\Question: Choose the right answer from options given a) ten b) eight c) no d) four
Example Output: d

Example Input: Lions spend much of their time resting and are active only about ____ hours every day.\Question: Choose the right answer from options given a) eight b) four c) no d) three
Example Output:
b