In the 2000s, the annual rate of increase in the average salary of a software engineer was nearly twice as fast as the 1990s.

A twice as fast as

B twice as fast as it was in

C twice that of

D two times faster than that of

E two times greater than

1. We are not comparing the decades. Hence, A and E are out.

2. Unless we can call the increases as one time, two times, the phrase 'two times' is not useful. You cannot describe a quantum in countable times. Therefore, D is out.

3. The rate of increase does not have speed. We can say-- Tom grows faster than Dick. However, we cannot say Tom's growth rate is faster than Dick's. Therefore, B is out.

C is the answer avoiding the above-said pitfalls. '

Generally, 'two times' is used more in informal daily conversations than 'twice' used in formal writing.

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