In the setup I said that only the Turner, the Whistler and the Vuillard can go between R_M. This question restricts R_M further. Since Turner must go before R_M and Whistler must go after, only Vuillard is left to go between.
There are two scenarios, since Vuillard can go third or fourth. Let’s build both at once. This is how I sketched it on my page:
RVM are a block. The question says that we have to place Turner and Whistler before and after this block. In the first diagram, Turner must go first, and Whistler goes after, along with PS:
The other diagram, with Vuillard fourth, doesn’t work. Once we place Turner and Whistler, there is no place to put the PS block:
(Turner doesn’t have to go second, I just placed it there to illustrate that this doesn’t work)
So only the other scenario works. We can use this to eliminate answers.
The diagram contradicts B through E. E is wrong because if Whistler were sixth then there’d be no way for PS to be beside each other.
A is CORRECT. Pissarro could go fifth. This scenario proves it:
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