PLEASE HELP

Which is the best way to
combine the following
sentences
using an adjective clause?
Diego was angry at his
stepfather. Diego's
stepfather grounded him
for cheating on a test at
school.
A. Diego's stepfather, whom Diego was
angry with, grounded him for cheating
on a test at school.
B. Diego was angry with his stepfather
because he grounded Diego for cheating
on a test at school.
C. Diego's stepfather grounded him
because he cheated on a test at school;
it made Diego angry.