The flow of Direct current (DC) is constant and flows in one direction. Most digital electronics make use of DC. Alternating current (AC) periodically flows in reverse and is mostly used to deliver power to houses, buildings and the like. With that alone, you can already rule out A, C and D.
The answer would then be B. constant, periodically reversing.
Answer:
It is larger than the Sun.
Explanation:
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They were produced inside stars.
Upwarped mountain is created when rock layers are pushed up by forces inside the Earth.
