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: Orangutans spend up to ____ hours a day eating or foraging for food.\Question: Choose the right answer from options given a) seven b) nine c) three d) six

Output: d


Input: Consider Input: Natural chlorine contains ____ isotopes.\Question: Choose the right answer from options given a) two b) six c) eight d) seven

Output: a


Input: Consider Input: Lobsters smell food or bait by using the ____ small antennae located on the front of it's head.\Question: Choose the right answer from options given a) two b) four c) three d) eight


Output: b