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D. Run-on Sentence 
The other options wouldn't make any sense except maybe "A", but a fragment is not completed whereas a Run-on would be completed, just lacking punctuation.

This sentence is incomplete. Its full version is:

A _______ is typically defined as two or more independent clauses joined without a punctuation mark or coordinating conjunction.

A. sentence fragment

B. complex-compound sentence

C. compound sentence

D. run-on sentence

Answer: It is option D (run-on sentence)

Explanation:

According to the definition, run-on sentences are complete sentences put together without a punctuation mark or coordinating conjunction.

For example, "I love traveling I would travel a lot if I had enough money."