Thanks for the question! So remember, the first reassignment is made according to plan 1. That means R and T switch. So now L is on S. Note also that M is on T. And then it doesn’t matter which plan we pick next. L and M switch. That means L is going to be on T, no matter which other plan we pick for the second reassignment. And that’s what (A) says.
Hope this helps! Feel free to ask any other questions that you might have.
