The answer is: it lacks information and details.
The opening sentence line of an informative essay should include further information and details, especially from authorized sources. The reason is the writer must convince readers to continue reading and provide evidence to support his or her point of view. Therefore, the audience will consider the text as a valuable reference and will be more likely to be persuaded by the author's perspective.
I think the answer is the wire must be part of a closed circuit.
I’m going to say a because of the comment if your talking about dependent and independent clauses
