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## Step 1<br />The problem is asking us to identify the correct statement about the Bell's theorem. The Bell's theorem is a principle in quantum mechanics that states that the total momentum of a system is conserved, even when the system is subjected to external forces.<br /><br />## Step 2<br />Let's analyze each option:<br /><br />a) This option states that the Bell's theorem is a mathematical formula. While the theorem does involve mathematical formulas, it is not just a mathematical formula. It is a principle that applies to the conservation of momentum in quantum mechanics.<br /><br />b) This option states that the Bell's theorem is a mathematical formula that describes the conservation of momentum in a system. This is a correct statement. The Bell's theorem is indeed a principle that describes the conservation of momentum in a system.<br /><br />c) This option states that the Bell's theorem is a mathematical formula that describes the conservation of momentum in a system. This is a correct statement. The Bell's theorem is indeed a principle that describes the conservation of momentum in a system.<br /><br />d) This option states that the Bell's theorem is a mathematical formula that describes the conservation of momentum in a system. This is a correct statement. The Bell's theorem is indeed a principle that describes the conservation of momentum in a system.