D.
In order to make sure your essay is coherent and the reader can follow it easily, you want to make sure that you've started with proper planning and outlining. If you have a clear thought on what order the main ideas will appear in, you can make sure they make sense in that order. Additionally, if you repeat important words, phrases, and ideas throughout the paper the reader will be reminded of what's most important which will help make it clearer and easier to understand and follow.
Answer:
Swiftly swimming across the seashore at sea.
The correct answer is D.
None of the words in this excerpt needs to be explain since they can all be understrood through context.
The world "passé" may be in a foreign language and unfamiliar for some of the readers, but the sentence structure helps understand its meaning from context.
The word "markerspace" is described in the same sentence, and therefore does not need further explanation.
The phrase "staying power" may be new for some readers but its meaning can be easily deducted from the word choice and the context of the sentence.