It is a A. simple sentence, because there is only one main verb - opened.
A compound sentence has at least two independent clauses, a complex sentence has an independent clause and at least one dependent, a compound-complex clause sentence has two independent clauses and at least one dependent.
"Michelle is terrified of spiders<u>. W</u>hen she found one in the bathroom, she panicked, refusing to shower for three days."
<span>. The Inchcape Rock is known for its infamy as causation for shipwreck. This poem by Robert Southey revolves around the famous folktale of an Abbot, a monk who placed a bell on the reef to issue warning to seamen and seafarers about the impending danger during storms. According to the folktale, whenever the bell used to ring, the seafarers used to bless the Abbot’s wisdom and thank him for saving them from danger.</span>
a. Employee complaints and d. Safety conditions
