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I am getting M1 as correct.

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I am not totally sure about it, but just going through some stack overflow answers i think you should consider the mask until we get contiguous string of 1’s, So in case of M1, we have effective subnet mask as 255.255.11000000.0

So, as we have given class B network so that will be 160.24.11011111.255, since the third bit is zero your subnet shoud be atleast 224 or more in third octet. So that’s why M2 and M3.

I am not totally sure about first part someone correct if I am wrong.