If you got question 21, then you could also have solved question 22. In question 21, I tried to put GL alone in group T. It didn’t work.
Go back and look at question 21 for the explanation.
D is CORRECT.
You can also solve this question by eliminating wrong answers. This scenario proves that either G or L could be alone in group T:
G and L are reversible, since no rules say which group G and L should go in. So A and B are wrong. Note that I’ve used a different diagram for reversibility. Sometime I draw arrows or arcs, as they’re easier than writing: G/L, L/G. Go with what works.
This diagram proves C and E wrong. Once again, G and L are reversible.
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