The sun . . . . . . . at six this morning.

arose
rose
aroused
raised

The correct answer is B. rose.

Arose is the past tense of the verb rise, which means to move up from a lower to a higher position. In this case, the sun is moving up from the horizon, so the correct verb to use is rose.

The other options are incorrect because they do not mean the same thing as rise. Arouse means to wake someone up or to make someone feel excited or interested. Raised means to lift something up or to increase the amount of something.