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: Cows have four stomachs, and the first ____ yield merchantable tripe.\Question: Choose the right answer from options given a) two b) five c) zero d) three

SOLUTION: d

PROBLEM: Mountain goats have ____ sharp horns.\Question: Choose the right answer from options given a) two b) six c) ten d) four

SOLUTION: a

PROBLEM: Viroids are known to cause disease in at least ____ plant groups.\Question: Choose the right answer from options given a) four b) two c) eight d) six

SOLUTION:
d