2. Proposition 1: In a rectangular prism, there must exist a point that is equidistant from all vertices;
Proposition 2: In a rectangular prism, there must exist a point that is equidistant from all edges;
Proposition 3: In a rectangular prism, there must exist a point that is equidistant from all faces.
Among the above three propositions, the correct ones are
A. 0
B. 1
C. 2
D. 3
By the symmetry of the cuboid, proposition 1 is correct; propositions 2 and 3 are incorrect. Therefore, the answer is $B$.