Three of the Following Statements Are Accurate with Regard to the Disadvantages

Three of the following statements are accurate with regard to the disadvantages of portfolios. Which statement is not necessarily accurate?

A) Teachers' overall ratings of portfolios often have low reliability.
B) Portfolios that contain only a few items may have poor content validity.
C) Portfolios often contain different products for different students,reflecting a problem with standardization.
D) Portfolios discourage students from being creative in their classwork.