A run-on sentence

A fails to express a complete thought and lacks proper punctuation

B is a dependent clause and lacks proper punctuation

C combines two or more complete thoughts without proper punctuation

D combines two or more dependent clauses without proper punctuation

is it c

Yes. C is right.

Yes, it is option C. A run-on sentence is a type of sentence that combines two or more complete thoughts without proper punctuation. These sentences occur when two or more independent clauses are joined together without the use of a coordinating conjunction or proper punctuation (such as a comma or a semicolon).