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]: Hybridization is the practice of ____ different species interbreeding.\Question: Choose the right answer from options given a) no b) one c) two d) three
[A]: c


[Q]: Matter exists in ____ forms, solid, fluid and plasma.\Question: Choose the right answer from options given a) ten b) nine c) three d) five
[A]: c


[Q]: Some particles are colour neutral but have only ____ quarks.\Question: Choose the right answer from options given a) three b) two c) four d) zero
[A]:
b