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').

Input: Consider Input: Chemical interactions are essentially electron interactions of ____ atoms.\Question: Choose the right answer from options given a) six b) no c) ten d) two

Output: d


Input: Consider Input: Couples often date from one to ____ years before getting engaged.\Question: Choose the right answer from options given a) three b) nine c) eight d) seven

Output: a


Input: Consider Input: Kittens start to eat solid foods from about ____ weeks and are fully weaned at about eight weeks.\Question: Choose the right answer from options given a) three b) six c) no d) one


Output: a