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: Sexual maturity occurs at three to four years for females and ____ to five years for males.\Question: Choose the right answer from options given a) nine b) seven c) five d) four

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

A: d
****
Q: Hydrops fetalis results from ____ Alpha-chain gene deletions .\Question: Choose the right answer from options given a) six b) one c) two d) four

A:
d
****