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: Carbon forms ____ bonds.\Question: Choose the right answer from options given a) five b) four c) two d) three

SOLUTION: b

PROBLEM: Dunes are of ____ types - linear and parabolic.\Question: Choose the right answer from options given a) three b) four c) ten d) two

SOLUTION: d

PROBLEM: Airbrushes come in ____ flavors.\Question: Choose the right answer from options given a) nine b) six c) seven d) three

SOLUTION:
d