To answer this question, the user needs to know the basics of PL/SQL and how it handles exceptions.

A. When a SELECT statement returns more than one row: This is one of the cases where PL/SQL raises an exception. If a SELECT statement returns more than one row in a context where a single value is expected, such as in an assignment statement or a SELECT INTO statement, then PL/SQL will raise the TOO_MANY_ROWS exception.

B. When a SELECT statement returns no rows: This is another case where PL/SQL raises an exception. If a SELECT statement returns no rows in a context where a single value is expected, such as in an assignment statement or a SELECT INTO statement, then PL/SQL will raise the NO_DATA_FOUND exception.

C. When INTO statement is missing in the SELECT statement: This is not a case where PL/SQL raises an exception. If an INTO statement is missing in a SELECT statement, then a compilation error will occur, but it will not result in an exception at runtime.

D. Both I and II: This option is correct. PL/SQL raises exceptions in both cases where a SELECT statement returns more than one row (TOO_MANY_ROWS) and where a SELECT statement returns no rows (NO_DATA_FOUND).

Therefore, the correct answer is: D.