The mechanisms for the formation of photoproducts A and B from a generic ketone starting material involve, respectively:

The fluorescence of A is quenched by 10% in the presence of 10 mM of B. If the fluorescence lifetime of A in the absence of B is 5 ns, the rate constant (in M -1 s -1 ) for the interaction between B and photo-excited A is:

In a standard Jablonski diagram, following initial excitation from the singlet ground state to the second singlet excited state (S0 → S2), radiationless deactivation from S2 → S1, radiative transition from S1 → S0, and radiative transition from T1 → S0 are represented by processes A, B, and C respectively. Identify the correct sequence of these processes.