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:
Control is defined as a dead plant with ____ signs of life.\Question: Choose the right answer from options given a) ten b) nine c) no d) zero

Ex Output:
c


Ex Input:
Notebooks are laptop computers that weigh between five and ____ pounds.\Question: Choose the right answer from options given a) ten b) seven c) nine d) one

Ex Output:
b


Ex Input:
Indoor pollution is ____ times as toxic as outdoor air.\Question: Choose the right answer from options given a) seven b) two c) ten d) zero

Ex Output:

c