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]: Diarrheal disease kills ____ million children every year.\Question: Choose the right answer from options given a) three b) no c) four d) ten
[EX A]: a

[EX Q]: Lions have ____ distinct vocalizations including roars, grunts and growls.\Question: Choose the right answer from options given a) eight b) six c) four d) nine
[EX A]: d

[EX Q]: Cleavage is very poor in ____ directions.\Question: Choose the right answer from options given a) eight b) six c) two d) five
[EX A]:
c