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').

Human females have ____ X chromosomes.\Question: Choose the right answer from options given a) two b) six c) one d) eight
a

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

Women are ____ times more likely to develop osteoporosis than men.\Question: Choose the right answer from options given a) ten b) one c) zero d) four

d