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:
Ammonia is among the ____ most abundantly produced chemicals in the world.\Question: Choose the right answer from options given a) five b) zero c) no d) eight

Ex Output:
a


Ex Input:
Parliaments can last five years, often last ____ and a bit.\Question: Choose the right answer from options given a) four b) three c) five d) two

Ex Output:
a


Ex Input:
Wiring refers to ____ techniques.\Question: Choose the right answer from options given a) five b) eight c) nine d) two

Ex Output:

d