In an effort to increase profits, the company moved
itself from emphasizing its chemicals business to expand into high-growth pharmaceuticals and futuristic biotechnologies.
(A) itself from emphasizing its chemicals business to expand
(B) itself from emphasizing its chemicals business then to expanding
(C) from an emphasis on its chemicals business and to expanding
(D) from an emphasis on its chemicals business and to expand
(E) from emphasizing its chemicals business to expanding
Parallel structure and logical meaning should take you where you want to go here. It needs to be emphasizing/expanding or emphasis/expand, but no mixing and matching. That eliminates A and C.
The idiom moves from/to eliminates B, C (again) and D. You can't have from/and to, as this logically doesn't make sense.
Moving itself doesn't work, unless the company is trying to dance. That eliminates A (again) and B (again).
Answer must be E by process of elimination, especially since the other choices have been doubly eliminated. And indeed E has the correct parallel structure and maintains the correct meaning, so that must be the answer.
Hope this helps!
-Ron