First, fill in the local rule. O speaks on friendship and majors in geology. Since M always speaks on friendship, that means M must major in history.
N and P are left and they will have to speak on liberty. N is a geology major (rule 6).
P and R can major in either journalism or history:
And that’s all we know. A is CORRECT. M must be a history major.
So we solved a bit more than we needed too, but it’s good practice to get all the deductions you can if they flow naturally. You never know which one will be the right answer.
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