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').

Ex Input:
Some families have two daddies or ____ mommies.\Question: Choose the right answer from options given a) nine b) seven c) zero d) two

Ex Output:
d


Ex Input:
Cougars have ____ toes with three distinct lobes present at the base of the pad.\Question: Choose the right answer from options given a) no b) four c) eight d) zero

Ex Output:
b


Ex Input:
Ecosystems come in ____ types.\Question: Choose the right answer from options given a) ten b) three c) no d) one

Ex Output:

b