Answer:
A simple sentence consists of <u><em>only one clause</em></u>. A compound sentence consists of two or more independent clauses. A complex sentence has at least one independent clause plus at least one dependent clause. A set of words with no independent clause may be an incomplete sentence, also called a sentence fragment.
The correct answer is. Looking from a window at the white cliffs of dover out to sea
This sentence is grammatically correct.
Maintaining eye contact with the speaker
I think.
because you could be writing notes, and that doesn't include eye contact