TASK DEFINITION: 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').
PROBLEM: Trains kill ____ people every year.\Question: Choose the right answer from options given a) zero b) three c) no d) four

SOLUTION: d

PROBLEM: 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

SOLUTION: d

PROBLEM: Most birds have an arrangement of ____ toes forward and one backwards.\Question: Choose the right answer from options given a) ten b) four c) three d) eight

SOLUTION:
c