[单选]
Examine the description of the MARKS table:
STD_ID NUMBER(4)
STUDENT_NAME VARCHAR2(30)
SUBJ1 NUMBER(3)
SUBJ2 NUMBER(3)
SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table:
SELECT subj1+subj2 total_marks, std_id
FROM marks
WHERE subj1 > AVG(subj1) AND subj2 > AVG(subj2) ORDER BY total_ marks;
What is the result of the SELECT statement? （）

A . The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.
B . The statement returns an error at the SELECT clause.
C . The statement returns an error at the WHERE clause.
D . The statement returns an error at the ORDER BY clause.

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Examine the description of the MARKS table:
STD_ID NUMBER(4)
STUDENT_NAME VARCHAR2(30)
SUBJ1 NUMBER(3)
SUBJ2 NUMBER(3)
SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table:
SELECT subj1+subj2 total_marks, std_id
FROM marks
WHERE subj1 > AVG(subj1) AND subj2 > AVG(subj2) ORDER BY total_ marks;
What is the result of the SELECT statement? （）

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