While an engaging text would be better for increasing the number of students willing to read, it doesn't figure out their comprehension level. Establishing a purpose for reading gives kids the will to read, but doesn't identify their comprehension. Choosing a text with complex characters provides <em>more </em>for readers to suck in, and can get confusing. This <em>certainly</em> doesn't help read their comprehension. Therefore, the answer is "asking questions during reading."
