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]: Redwoods reproduce ____ ways.\Question: Choose the right answer from options given a) zero b) two c) six d) nine
[EX A]: b

[EX Q]: Electrons have almost ____ mass and are negatively charged.\Question: Choose the right answer from options given a) three b) seven c) zero d) no
[EX A]: d

[EX Q]: Japan can produce nuclear weapons in ____ months.\Question: Choose the right answer from options given a) ten b) six c) zero d) three
[EX A]:
d