A. Merciful
B. Generous
C. Lenient
D. Tolerant
Merciful : showing or exercising mercy.
Generous : showing a readiness to give more of something, especially money, than is strictly necessary or expected.
Tolerant : showing willingness to allow the existence of opinions or behaviour that one does not necessarily agree with
Lenient : more merciful or tolerant than expected, flexible.
Rigid : unable to bend or be forced out of shape, not flexible.
Appropriate antonym of Rigid is Lenient.
