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C. Angle MNP

Step-by-step explanation:

Check the corresponding equal sides with congruent angles

Third choice.

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Explanation:

We want to find something congruent to angle ABC.

With angle ABC, we have

The order is important.

Looking at the triangle on the right, we see that

The sequence of arc markings can be written as 3,1,2

Now focus your attention on the triangle on the left. Start with the triple arc angle, move to the single arc angle, then go to the double arc angle. You should trace out M, N then P in that exact order.

Therefore

Note how M is first, N is second, then P is third.

This lets us form these pairs of congruences

or