The evidence that best supports the idea that Mrs. Medlock is hiding something from Mary is "You didn't hear anything of the sort..."
In the excerpt, the evidence that best supports the idea that Mrs. Medlock is hiding something is when she tells Mary that she did not hear anything. We can see that she is hiding something because she says "the sort" which proves that there is something related to a girl crying.
Let's see why the other options are not evidence
It's not evidence because it only shows that she is mad at Mary for being out of the room.
It is not correct because it is only showing what Mrs. Medlock thinks of Mary.
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