This question says Yoshio isn’t assigned to the project. This means we’re in scenarios 1 or 2, since in scenario 3 Y had to be assigned.
Note that I didn’t redraw anything for this in timed conditions. I just looked at my main setup, and noted who had to be in for each scenario if Y is out.
In the first scenario, normally L or Y can go fourth. But since this question eliminates Y, then L must go forth. The same logic means that T must go in 1924 in scenario two.
So that lets us predict the answer: L in 1924, or T in 1924.
E is CORRECT. L can be assigned to 1924 in scenario 1.
None of the other answers are possible. If Y is out, then both scenarios require L, R and T to be assigned. And O must be in 1921 in both scenarios.
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