Remark
I think you need to to define a couple of words before answering the question. The reason will be given after the definitions.
Definitions
A salver: A salver is a small silver try mostly flat that carries drinks, or small announcement cards or unopened letters.
The other word you need to know is the Chantant which I used Google to look up. It is a small outdoor cafe, very intimate with a small staff and a small number of guests.
Neither of these definitions are meaningful without some explanation, but they had to be noted.
Reason
The reason I looked them up was I wanted to be taken away from the comparison with a church. That's something you could use in an essay and very effectively, but not here.
Choice
Having said all of that, I believe your choice is a good one. The answer is the last sentence. There are a number of reasons I would pick it.
1. They are counting coins. There couldn't be too many if they fit on a salver.
2. There were only 2 men doing the counting. Where was the rest of the money? Surely the Cafe Chantant brought in more than a few coins. These men much have doing something else. It made money, but not much.
3. The salver itself suggests wealth. Only the very rich used them. They were quite popular in the 1750s.
