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]: Reptiles also have scaly skin and a ____ chambered heart.\Question: Choose the right answer from options given a) zero b) one c) ten d) three
[A]: d


[Q]: Most resistors have three coloured bands close together at one end and ____ single band at the other.\Question: Choose the right answer from options given a) two b) one c) ten d) five
[A]: b


[Q]: Breast cancer accounts for ____ out of every three cancer diagnoses in the United States.\Question: Choose the right answer from options given a) two b) one c) three d) nine
[A]:
b