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:
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

Ex Output:
a


Ex Input:
Bulbs bloom four to ____ weeks after planting.\Question: Choose the right answer from options given a) seven b) one c) six d) nine

Ex Output:
c


Ex Input:
Interoperability benefits the development of competition on ____ levels.\Question: Choose the right answer from options given a) two b) nine c) one d) eight

Ex Output:

a