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: Many animals use two or ____ forest structure types.\Question: Choose the right answer from options given a) eight b) zero c) two d) three

Output: d


Input: Consider Input: Babies show an interest in solid foods when they are approximately four to ____ weeks old.\Question: Choose the right answer from options given a) nine b) eight c) five d) six

Output: c


Input: Consider Input: Sexual maturity is reached within two to ____ years.\Question: Choose the right answer from options given a) six b) seven c) four d) ten


Output: c