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: Some programming languages have ____ or more standards.\Question: Choose the right answer from options given a) no b) seven c) two d) three

SOLUTION: c

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: European cities tend to have population densities more than ____ times that of U.S. urban areas.\Question: Choose the right answer from options given a) zero b) ten c) no d) four

SOLUTION:
d