Which One of the Following Teachers Is Most Clearly Engaging

Which one of the following teachers is most clearly engaging in reflective teaching?

A) An art teacher lets students choose which of three media they would like to use in their painting: acrylics,oils,or watercolors.
B) When students are clearly bored during a class lecture,a history teacher thinks about ways in which he might make the subject matter more interesting.
C) A math teacher gives her students homework every night so that they can practice using the new procedures they've learned in class that day.
D) A science teacher writes and administers a multiple-choice test to assess what students have learned in a recent unit about mollusks and crustaceans.