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B is wrong because is not possible to have two subnets with the same CIDR range within a VPC, as it would cause an IP conflict.
This question and answer doesn't add up to me. Why would you need to have a different CIDR range and a different region? For example, if I had 10.0.1.0/24 in us-central1 region, why can't i just use 10.0.2.0/24? in the same region and "/24" is the same CIDR range. The correct answer does not make logical sense to me.
Good perspective. Theoretically it should be possible. But CIDR Range includes both IP Address and Subnet Mask. You are saying that "/24" is the same CIDR range. (but you are referring to subnet mask) But 10.0.1.0/24 and 10.0.2.0/24 are different CIDR Range if compared. Hence option A is relevant, Different CIDR