Respuesta :
The correct answer is A. A complex sentence that provides a main idea and a closely related detail
Explanation:
In grammar, a complex sentence includes a independent clause which in this case is "we still stopped to have our picnic" and at least one dependent clause which in this case is " we were late for our appointment" that depends on the independent clause and it is introduced by subordinating conjunctions such as because, until, when, since or although. This implies the sentence presented is a complex sentence as it includes an independent clause, a dependent clause, and one subordinating conjunction. Besides this, the subordinating conjunction adds information to the main idea or clause as it is a detail related to it. According to this, the statement that best describes this sentence is "A complex sentence that provides a main idea and a closely related detail".