1) long and rambling is an incorrect answer. A long and rambling sentence would be extensive and repetitive, going on for a while and saying irrelevant or unnecessary things.

2) humorous and colorful is also incorrect. A humorous and colorful sentence would be joking or funny, and would show the strength of the writer's personality.

3) unusual and complex is an incorrect answer. An unusual and complex sentence would show something new and different to the reader, as well as be a long, multi-part sentence with several dividers such as commas, semicolons, dashes, or other punctuation marks.

4) short and simple is the CORRECT answer. A short and simple sentence is not long or confusing. The reader understands the purpose of the sentence easily. The sentence does not necessarily show any sense of humor or personality from the writer. The sentence is not split into multiple parts or difficult to read.