Which statement is true about transactions? 

Answer options:

A. A set of Data Manipulation Language (DML) statements executed in a sequence ending with a SAVEPOINT forms a single transaction.
B. Each Data Definition Language (DDL) statement executed forms a single transaction.
C. A set of DDL statements executed in a sequence ending with a COMMIT forms a single transaction.
D. A combination of DDL and DML statements executed in a sequence ending with a COMMIT forms a single transaction.

B

References: https://docs.oracle.com/database/121/CNCPT/transact.htm#CNCPT038