Final answer:
To revise the sentence using a participle as an adjective, one could say: 'The slowly rising sun spreads its light along the horizon.' 'Rising' acts as an adjective that describes the sun.
Step-by-step explanation:
The question asks to choose a revision of the sentence "The sun rises slowly, and its light spreads along the horizon" that uses a participle as an adjective. A participle is a verb form that is used as an adjective to modify nouns or pronouns. In the sentence provided, 'rising' and 'spreading' are the present participles of the verbs 'rises' and 'spreads'. To use a participle as an adjective, we could revise the sentence to:
The slowly rising sun spreads its light along the horizon.
In this revision, 'rising' is used as an adjective to describe the sun. It explains what the sun is doing in a descriptive way and modifies the noun 'sun' with more detail, exactly like an adjective would.