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]: Mothers usually give birth to one, two, or ____ babies at a time.\Question: Choose the right answer from options given a) three b) zero c) five d) ten
[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]: Honey bees use ____ systems of feeding larvae.\Question: Choose the right answer from options given a) seven b) six c) two d) one
[EX A]:
c