Yes, C2A and D 10 refer to B\C\D mentioned in the title, and the trip curve refers to the instantaneous trip action current.

B: the tripping current is 3-5In, which is suitable for non-inductive or micro-inductive circuits;

C: the tripping current is 5- 10In, which is suitable for lighting or resistive circuits;

D: trip current 10-20In, suitable for power supply or inductance circuit;

The diagram B you see is broken between 3 and 5, which may cause a trip, and so are the others.