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:
Conflict occurs between when ____ people have a car accident.\Question: Choose the right answer from options given a) no b) eight c) two d) nine

Ex Output:
c


Ex Input:
Nymphs feed and mature through ____ instars in about six to eight weeks.\Question: Choose the right answer from options given a) four b) eight c) five d) no

Ex Output:
c


Ex Input:
Milk teeth stay in a child up to the age of seven to ____ years.\Question: Choose the right answer from options given a) no b) eight c) ten d) seven

Ex Output:

b