1. Could you tell me what is the difference between A and B in square brackets of the following sentence and which one is preferred between them?
It is [A. the reason / B. for this/that reason] that clear criteria and controls should be implemented to ensure that cloned animals are prevented from entering the food chain.
2. Can A or B be replaced with "this/that reason" in the same sentence? That is to say, does "It is this/that reason that clear criteria ~" also sound natural?
1. It is the reason that clear criteria and controls should be implemented ... 2.
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1. It is the reason that clear criteria and controls should be implemented ...
2. It is for this/that reason that clear criteria and controls should be implemented ...
3. It is this/that reason that clear criteria and controls should be implemented ...
In (1), "It" refers to something previously mentioned or known from context. That thing is the reason. I