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: 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: Potential energy is divided into ____ different types of energy.\Question: Choose the right answer from options given a) eight b) three c) zero d) two
Example Output: b

Example Input: Most plants develop into small bushes with up to ____ basal stems.\Question: Choose the right answer from options given a) four b) one c) no d) six
Example Output:
d