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]: Nodes are points in space that have ____ probability for locating an electron there.\Question: Choose the right answer from options given a) no b) six c) zero d) three
[EX A]: c

[EX Q]: Most marine sediments are of ____ basic types.\Question: Choose the right answer from options given a) three b) ten c) two d) nine
[EX A]: c

[EX Q]: Current weight multiplied by ____ roughly equals the calories needed to maintain weight.\Question: Choose the right answer from options given a) no b) ten c) three d) seven
[EX A]:
b