The basis of well-test analysis for homogeneous-acting reservoir is（）.

The basis of well-test analysis for homogeneous-acting reservoir is（）.
A.the line-source solution to the diffusivity equation
B.the line-source solution to the state equation
C.the line-source solution to the fluid motion equation
D.the line-source solution to the fluid continuity equation
正确答案：the line-source solution to the diffusivity equation