Reading Comprehension: Identifying the Question Type

To which Reading Comprehension question type does the following question stem belong?

"The author suggests that..."

You're right!

Style and Tone questions are abut the author's attitude and tone, not about what the author implies or suggests.

Main Idea questions usually include a word that stresses the fact that they ask about the entire passage, such as primarily, chiefly or mainly.  

Detail questions ask about what is clearly stated in the passage, not about what is implied by the passage or its author.