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').

Tropical trees can be rampant growers, and can outgrow a wiring in as little as ____ days' time.\Question: Choose the right answer from options given a) four b) eight c) six d) ten
d

Granite occurs in ____ separate masses.\Question: Choose the right answer from options given a) two b) eight c) nine d) no
a

Rainbow trout breed every three to ____ years.\Question: Choose the right answer from options given a) one b) seven c) five d) no

c