（147）View the Exhibit and examine the structure of the PROMOTIONS table. Evaluate the following SQL statement:

SELECT promo_name,CASE WHEN promo_cost >= (SELECT AVG(promo_cost) FROM promotions WHERE promo_category='TV')

THEN 'HIGH' ELSE 'LOW' END COST_REMARK

FROM promotions;

Which statement is true regarding the outcome of the above query?

A. It shows COST_REMARK for all the promos in the table.

B. It produces an error because the subquery gives an error.

C. It shows COST_REMARK for all the promos in the promo category 'TV'.

D. It produces an error because subqueries cannot be used with the CASE expression.

答案：（A）

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