Which One of the Following Is the Best Example of a Discovery

Which one of the following is the best example of a discovery learning approach to instruction?

A) Ms.Martin instructs her students to take notes during her lecture and then goes over the notes with them to make sure that they understand the material.
B) Mr.Tseng gives his students a free day to spend in the library reading about whatever subjects they like.
C) Mr.Won takes his science students to a tide pool and asks them to describe and categorize the different life forms they find there.
D) Ms.Henderson instructs her drama students to think about what their characters are like as they memorize their lines for a play.