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: Food chains consist of ____ trophic levels.\Question: Choose the right answer from options given a) ten b) three c) one d) four

SOLUTION: d

PROBLEM: Centrifugal pumps can usually handle up to about ____ percent by volume of air.\Question: Choose the right answer from options given a) one b) five c) eight d) seven

SOLUTION: b

PROBLEM: Dandelions reproduce in ____ ways.\Question: Choose the right answer from options given a) four b) eight c) two d) no

SOLUTION:
c