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').

Rheumatic fever begins one to ____ weeks after an untreated streptococcal infection.\Question: Choose the right answer from options given a) six b) ten c) two d) zero
a

Peonies grow from two to ____ feet in height.\Question: Choose the right answer from options given a) five b) zero c) three d) four
d

Typical mycobacteria fall into ____ main patterns of their mycolic acid composition.\Question: Choose the right answer from options given a) no b) four c) zero d) two

b