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').

Sports bras come in ____ basic styles.\Question: Choose the right answer from options given a) five b) six c) two d) zero
c

Astronomical observations suggest ____ or close to zero space-time curvature.\Question: Choose the right answer from options given a) six b) zero c) ten d) seven
b

Melanocytes are dendritic and are distributed roughly one per ____ basal cells.\Question: Choose the right answer from options given a) seven b) four c) six d) two

c