Which would most improve the coherence of an essay? a) adding vivid sensory details and active verbs reactivate b) revising the essay to past tense to link ideas c) using active voice and first person point of view d) planning an order and repeating key words and phrases

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.