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: Reservoirs cover an area of the planet ____ times the size of Britain.\Question: Choose the right answer from options given a) two b) eight c) three d) six
Example Output: d

Example Input: Cleavage occurs typically in either one, two, three, four, or ____ directions.\Question: Choose the right answer from options given a) six b) three c) ten d) two
Example Output: a

Example Input: Martens produce one litter per year, with an average of slightly less than ____ young per female.\Question: Choose the right answer from options given a) one b) two c) four d) three
Example Output:
d