With reference to source A and source B interpret the extent to which (quote from either source) can be said to (relate to module topic). (20)

This question is which would ask students to explain with reference to two sources (nearly always quotes from historians) which interpretation of a key event they most agree with. Candidates are often advised to limit their discussions of said interpretations only to those brought up in the sources to avoid going off the mark scheme and so will typically have a answer structure of two paragraphs in which they analyse both sources while adding in their own knowledge with higher end answers mixing in analysis from one historian into the "other" paragraph to draw more contrasts etc.
Such questions will typically have the sources disagree on most things about the event, which depending on the A Level course and sub-options could range from the topic of the Fourth Crusade to the Fall of the Soviet Union etc. However the sources might sometimes agree on things either as an opening for lower end candidates or for higher end candidates to further their discussions of how the interpretations differ and yet also how they can converge in some areas. Typically the historians chosen themselves come from very different perspectives to ensure the candidates can truly dig in to the sources as much as possible.