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: Bulbs bloom four to ____ weeks after planting.\Question: Choose the right answer from options given a) seven b) one c) six d) nine
Example Output: c

Example Input: Human malaria is caused by ____ species of Plasmodium . .\Question: Choose the right answer from options given a) six b) ten c) seven d) four
Example Output: d

Example Input: Pigeons are social birds, so plan on ____ to five mated pairs to start.\Question: Choose the right answer from options given a) three b) one c) nine d) six
Example Output:
a