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').

Q: Most people have ____ kidneys.\Question: Choose the right answer from options given a) two b) five c) seven d) six

A: a
****
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

A: a
****
Q: Lasers consist of ____ components.\Question: Choose the right answer from options given a) six b) four c) zero d) five

A:
b
****