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').
--------
Question: 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

Answer: c


Question: Embrasures have ____ functions.\Question: Choose the right answer from options given a) three b) seven c) zero d) nine

Answer: a


Question: Crabs have ____ pairs of gills.\Question: Choose the right answer from options given a) two b) nine c) five d) no

Answer:
b