Question

From 1965 on, the region’s standard of living has soared, but also unemployment and prices.

Answer 1

Answer:

The correct answer is C: but so have .

Explanation:

After but we need an auxiliary verb to keep both parts of the question parallel, so we won't use A, B, and D, as these options do not have both parts parallel.  

As the action started in 1965 and it is still valid, we should use the Present Perfect, so we won't use E (as this is Past Simple).

Therefore, the correct answer is C.