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 Q]: Most aphthous ulcers heal in one to ____ weeks.\Question: Choose the right answer from options given a) two b) eight c) one d) seven
[EX A]: a

[EX Q]: Neutrinos are particles with almost ____ mass and no electric charge.\Question: Choose the right answer from options given a) no b) two c) zero d) five
[EX A]: a

[EX Q]: Men are ____ times as likely to commit suicide than women.\Question: Choose the right answer from options given a) seven b) two c) four d) one
[EX A]:
c