Sample of two radioactive nuclides A and B are taken. `lambdaa_A` and `lambda_B` are the disintegration constants of A and B respectively. In which of the following cases, the two samples can simultaneously have the same decay rate at any time:

Options

A. initial rate of decay of A is twice the intial rate of decay of B and `lambda_A=lambda_B`.
B. initial rate of decay of A is twice the intial rate of decay of B and `lambda_Agtlambda_B`.
C. initial rate of decay of B is twice the intial rate of decay of A and `lambda_Agtlambda_B`.
D. initial rate of decay of B is the same as the rate of decay of A at t=2h and `lambda_Bltlambda_A`.