D is the answer cause a complex sentence has one dependent clause and one independent clause
I use dictionary dot com whenever I have to find synonyms and antonyms. or thesaurus dot com I just put in the word and it gives me the tons of synonyms.
He was frustrated for obvious reasons. But was described as 'perplexed and still' because he expected a answer from the inmates that were inside the house, but instead of answering his repetitive calls, they chose to give no response leaving the traveler to experience his 'stillness'.
They may have different ideals and different ideas of what good morals are. There are also different rules.