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').

[EX 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
[EX A]: c

[EX Q]: All loci have ____ or two alleles.\Question: Choose the right answer from options given a) no b) six c) four d) one
[EX A]: d

[EX Q]: Earthworms are about four to ____ inches in length.\Question: Choose the right answer from options given a) zero b) nine c) five d) eight
[EX A]:
c