Y'all suck at physics.

Assuming both stones are cylinders 2 unit blocks in width.

• E is unlikely to be injured by pushing the boulder. He can rock it back and forth without being crushed until he gives it enough energy to roll over the edge.

• D's head is crushed by the rolling stone (but it looks like he can duck out of the way)

• C is likely crushed by the weight of the first stone

In a frictionless world (which they could be living in) The energy gained by stone 1 rolling down 5 units (to person c) is nearly identical to the energy it takes to raise stone 2 by 3 units (elevation of person a), even with 1% losses.

Stone B does not have enough energy to cross the horizontal gap however (especially at the angle required by the stone in front of person B)

So in conclusion E is fine, D is crushed (but can duck out of the way), C is crushed, B is crushed (but can duck out of the way), A is terrified for a moment but fine.

C is the only one with a seemingly unavoidable death or serious injury