Respuesta :
Complex. It is not compound because there are not 2 subjects and 2 verbs. A simple sentence consists of a single verb clause.
Complex sentence = verb clause + adverb clause
Answer: B) Complex.
Explanation: a complex sentence, is a sentence that contains an independent clause (a phrase that have complete meaning on its own) and at least a dependent clause (a phrase that doesn't have complete meaning on its own). The given sentence is complex because it has the independent clause "we arrived at the flower shop five minutes before closing" and the dependent clause "Running out of time."