Why is diction important in a piece of writing?
a. it gives meaning by grouping words sensibly and logically.
b. it is essential for clear and understandable written communication.
c. it to make communication and explanation more specific.
d. it is made of grammatical rules that guide the structure of sentences.

The right answer is a.It gives meaning by grouping words sensibly and logically. Diction means word choice. The general character of the  language used by the author, how a writer uses language  for a distinct purpose and effect, including word choice and figures of speech. Examine the following when considering word choice:  Informal Diction (personal writing) and  Formal Diction (academic or literary writing). And also, Types of Diction : Colloquial words – conversational language; Slang – highly informal ; Jargon – the special language of a profession or group (lawyer talk, technical talk) .

to create suspense.