A question of fact would be:
A) does overeating cause obesity?
B) is small beautiful?
C) should all people have equal opportunities?
D) is procrastination a bad habit?

  A) does overeating cause obesity?

Explanation:

Terms in all of these questions often have fuzzy definitions, so it is often a matter of judgment whether a particular condition is or is not included in the discussion.

The question most likely to be considered a question of fact is ...

  A) does overeating cause obesity?

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"Overeating" and "obesity" can be objectively defined, even if the causal relationship is less easy to establish.

"Beautiful" is usually a matter of opinion, and cannot be considered a matter of fact.

"Equal opportunities" is exceptionally difficult to define considering the range of personalities and abilities that may be offered a given opportunity. This is another term that is more a matter of opinion than of fact. Whether something "should" or "should not" be provided is, likewise, a matter of opinion (or personal philosophy or religion).

"Bad habit" is another descriptor that is difficult to say is a matter of fact. Whether something is "good" or "bad" depends on the goal, and the effect of procrastination depends on the circumstances.

their visual appeal is a sure hook into their content. but big books are also produced for pedagogical reasons, and using them in the classroom makes good teaching sense. an abundance of good children's literature in their lives is vitally important for young children as they strive toward independent reading.