In this case (unlike the
more generic, non-call version of the question), Jehoash is negated due to Call. Therefore, the capture is negated, which puts King Amazing back in battle. Because of cascade-negate, Isaiah is kicked out of battle (King Amazing's 'add hero' clause is cascade-negated by Call via Jehoash's capture being undone). However, cards are unable to cascade-negate
themselves (see FTBN-ending bands for similar rulings). Therefore, Call is not negated (note that it was not CBN unless played
by Isaiah in battle). Also, since Isaiah is CBN, he is not cascade-negated, and his protection stands. Battle resumes with King Amazing and protected purple kings versus a negated Jehoash. Call is no longer negating anything going forward as well, since Isaiah is not in battle.
So option b, with a twist.
EDIT: Just merged the threads, since you are pretty clearly each asking about the same game.