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 children improve in three to ____ days.\Question: Choose the right answer from options given a) seven b) six c) four d) ten
[A]: a


[Q]: Oranges signify good health, and the number ____ sounds like the word for prosperity.\Question: Choose the right answer from options given a) eight b) ten c) seven d) five
[A]: a


[Q]: Most curable tumors require at least ____ to eight cycle of therapy.\Question: Choose the right answer from options given a) zero b) no c) three d) six
[A]:
d