The element of an effective plotline that helps move the story forward and keep the reader engaged is, Strong tension and suspense.
Plotline is the series of events that connects together and forms a story.
Because a strong tension and suspense engage the reader with mystery and brings out surprises and tension to what will happen nest in the story, which keeps the reader engaged, and all the twist brings out the unexpected plotline which acts as a tension and suspense for the readers.
Hence the correct option is, D. Strong tension and suspense.
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