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Your answer is correct!

Indeed, the protons of the metyl-group give rise to only a single signal at room temperature.
That is, however, not all that obvious if you have a closer look at the shown structure of the molecule.
In this specific conformation, there should be two signals from the methyl group - one from proton H1 and an additional signal from the protons H2 and H3, since H2 and H3 apparently are exposed to an identical electronical environment; different from the one for proton H1

Now give the reasoning for your answer and compare it to the example for a single signal for a methyl group. Also, check the answer!