Colorful - this is because it is not capitalized and it's describing something<span />
Here is the list of the correct answers of the given statements above:
<span>1. Correctness of phrases and clauses = Usage
2. Word choices made for tone or clarity = Diction
3. The order of words in a sentence = Syntax.
4. Staying on topic in an essay or paragraph = Unity
5. Words that connect ideas and paragraphs = Transitions.</span>