84. The following is a statement of “algorithm for square-root multiplication” in asecondary school textbook,“The product of the positive square roots of two positive numbers is equal to thepositive square root of the product of the two positive numbers.”After teaching, Ms. Guo found that most students learned the expressionalrepresentation of this statement, a b ab × = , but did not understand the abovestatement. Please choose the most effective teaching activity from the following to helpstudents understand the statement.
(A)Thoroughly re-teach the concept of the algorithm.
(B)Give students corresponding numerical expressions of the statement, such as23 6 × = , and ask students to describe it with words.
(C)Ask students to start with a part of the statement and gradually expand it and thenjudge the relations among all mathematical objects in the statement.
(D) Ask students to do more exercises pertinent to the algorithm.