Doubling the operating frequency of a capacitive circuit: A. doubles the amount of a capacitive reactance B. has no effect on the capacitive reactance C. cuts the capacitive reactance in half D. multiplies the capacitive reactance by 6.28 E. None of the above

The correct answer is: A. doubles the amount of a capacitive reactance.

Capacitive reactance is inversely proportional to frequency. This means that if the frequency doubles, the capacitive reactance doubles.

Option B is incorrect because doubling the frequency would increase the capacitive reactance, not have no effect on it.

Option C is incorrect because doubling the frequency would increase the capacitive reactance, not cut it in half.

Option D is incorrect because doubling the frequency would increase the capacitive reactance by a factor of 2, not 6.28.

Option E is incorrect because doubling the frequency does have an effect on the capacitive reactance.