A. DML statements always start new transactions. (X). Not always
B. DDL statements automatically commit only data dictionary updates caused by executing the DDL. (X) Not "only" data dictionary
C. A session can see uncommitted updates made by the same user in a different session. (X) in the same session
D. A DDL statement issued by a session with an uncommitted transaction automatically commits that transaction.
E. An uncommitted transaction is automatically committed when the user exits SQL*Plus.
A : transaction contains of one or more dml statements or DDL statement
D : because DDL make commit before and after DDL statement
https://docs.oracle.com/cd/E11882_01/server.112/e40540/transact.htm#CNCPT016
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