Answer:
1. compound
2. complex
3. I believe this one is complex if not then it's simple
4. complex
The answer is letter a. From the properties of silver, it is shiny and smooth and not as dense as gold, hence the river is a shining river. So it becomes, "Behold the shining river, in it the splashing horses loitering stop to drink"
The main idea behind it is that life is short and that we need to laugh and be happy while we have time and not focus on negative things because life is short. If life hits you in the teeth there's no reason to be depressed forever about it, just laugh and be happy and keep moving on.