Shed some light

[smagish]

The record of the past is always incomplete, and the historian who writes about it
inevitably reflects the preoccupations of their own time.
(A) the historian who writes about it inevitably reflects
(B) the historian writing about it will inevitably reflect
(C) a historian writing about it inevitably reflects
(D) writing about it, it is inevitable for historians to reflect
(E) historians in writing about it inevitably reflect

[machichi]

The problem with the sentence is that historian doesn't match up with their--so the singular subject has a plural possessive pronoun.

We can quickly eliminate A, B, and C. D has a misplaced modifier--don't mean to get technical but it might help to look that up. The "it" is the subject which is somehow "writing".

An easier example,

Being on fire, he stared at the house. That means he was on fire. The correct version is "Being on fire, the house grabbed his attention." Or some other such fix.

Correct answer: E