Why is end-to-end encryption deployed when exposing sensitive data through APIs?

Why is end-to-end encryption deployed when exposing sensitive data through APIs?
A . Traffic is encrypted and decrypted at every hop in the network path.
B . Data transfers are untraceable from source to destination.
C . Data cannot be read or modified other than by the true source and destination.
D . Server-side encryption enables the destination to control data protection.

Answer: C