Answer:
A. I have a dream that one day this nation will rise up, live out the true meaning of its creed
Step-by-step explanation:
Colorful language tends to be more descriptive (often by using adjectives that are more precise) creative and it may appeal to people's senses as well, hence, a piece of writing with a colorful language tends to be more eye-catching and memorable. Unlike other options, option A achieves this purpose by using words like "rise up", "live out" and "true meaning".