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: Today there are ____ UK hospitals doing heart transplants.\Question: Choose the right answer from options given a) three b) five c) six d) nine
Example Output: d

Example Input: Government is divided into ____ basic functions.\Question: Choose the right answer from options given a) three b) no c) two d) four
Example Output: c

Example Input: Motion has ____ components, speed and direction.\Question: Choose the right answer from options given a) four b) zero c) two d) seven
Example Output:
c