Problem: The initial question asks who suffers the consequences first.
Solution: By forgetting the misleading ground markers,  the rock pushed by E descends in a straight line . With D positioned in the axis, he is the first to find himself in difficulty.

Second effect: the shock tilts the board towards the other end, which lowers the part located above C —  C’s position then becomes the most exposed .

Third time: the other end of the board lifts, lightening the second rock and allowing it to roll; on its trajectory, it is B who is then affected.

Conclusion, in order of unfavorable events  : D, then C, then B. A remains in the background, sheltered from the chain of actions.

Mental trick  : Think “dominoes.” When the first one falls, everything falls in succession. Here, “domino” #1 is the slope; #2 is the plank; #3 is the second rock.

What this game reveals about your thinking

Problem: Are you hesitating, changing your mind, or seeing several possible scenarios?

Solution:  This is completely normal!  Your brain explores different avenues, like a director doing multiple takes.

The main thing is not to know everything about physics, but  to identify the trigger element (the slope) , to anticipate the reaction of the board, then to follow the logic to the end.