You can add interest to your essay by
a. alternating short and long sentences.
b. using appropriate transitions between ideas.
c. presenting the information in a logical order.
d. summing up key points throughout the text.

A is the most suitable answer, although all of the answers are technically correct. B, C and D all serve to add clarity to an essay, which in turn adds interest. A directly adds interest, and the clarity comes as a secondary effect.

The meaning of the word in this sentence is unneeded

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