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: Ankle joint has ____ degrees of freedom.\Question: Choose the right answer from options given a) seven b) eight c) four d) three

SOLUTION: d

PROBLEM: Echinoderms usually have ____ appendages, but there are some exceptions.\Question: Choose the right answer from options given a) ten b) five c) seven d) three

SOLUTION: b

PROBLEM: Natural selection affects the distripution of phenotypes in ____ ways.\Question: Choose the right answer from options given a) four b) three c) two d) no

SOLUTION:
b