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]: Diploid cultivars have ____ alleles.\Question: Choose the right answer from options given a) eight b) six c) two d) five
[EX A]: c

[EX Q]: Circles mark the approximate locations of ____ recently discovered solar systems.\Question: Choose the right answer from options given a) four b) no c) zero d) nine
[EX A]: a

[EX Q]: Salvation is based on work through implementing the ____ pillars in life.\Question: Choose the right answer from options given a) zero b) six c) no d) five
[EX A]:
d