A regular pattern of stressed or unstressed syllables
A diction
B rhyme
Cmeter
Dform

C. meter.

Explanation:

Poetry involves the use of numerous 'elements' that enables a poet to express words for the reader's better understanding of the emotions and feelings. These elements include features such as meter, rhyme, rhythm, diction, form, sound, etc.

Meter is one element of poetry that is the rhythmic structure of the lines in a poem. It is the pattern of the stressed and unstressed syllables of the words in the line of poetry. And there are different forms of the meter such as iambic, dactyl, anapestic, or trochaic.

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jenkins wanted the narrator to write a ghost story for his magazine. he wanted the narrator to give the readers a story based on the supernatural. he wanted him to give the readers real 'horror' stories and not the type of live ghosts which he had presented in his earlier stories.