Option C
2-Phase locking: It provides a serializable schedule but does not provides a deadlock free serializable schedule. Deadlock might occur using this concurrency control mechanism.
Time Stamp Protocol: It suffers more aborts in comparison of other concurrency control protocols because of allowing the execution of the transactions based upon their time stamp ordering. A transaction with higher timestamp is allowed to execute otherwise if a transaction with lower timestamp requests for execution then in that case that transaction will be aborted.