Choice "B" is correct. Tender of performance by the principal debtor completely releases the surety, even a compensated surety.
Choice "d" is incorrect. Changing the manner of payment will release a compensated surety only if the change increases the surety's risk.
Choice "a" is incorrect. Changing the time of payment will release a compensated surety only if the change increases the surety's risk.
Choice "c" is incorrect. Partially releasing the principal will only partially release the compensated surety.
