Choice "C" is correct. The FDCPA gives parties injured by unfair collection practices the right to sue for damages. 15 USC 1692k(a)(1)
Choice "b" is incorrect. The FDCPA gives parties injured by unfair collection practices the right to sue for damages. It does not provide for abolishment of the debt.
Choice "a" is incorrect. The FDCPA gives parties injured by unfair collection practices the right to sue for damages. It does not provide for a reduction of the debt.
Choice "d" is incorrect. The FDCPA gives parties injured by unfair collection practices the right to sue for damages. It does not provide criminal penalties.