Which One of the Following Teachers Is Engaging Students in a Developmentally

Which one of the following teachers is engaging students in a developmentally appropriate science activity?

A) Mr. Kirk's kindergartners are hypothesizing about why the sun appears to rise and set in the sky.
B) Ms. Hannigan's third-grade class is studying water molecules as part of a unit on the water cycle.
C) In his high school astronomy class, Mr. Brulet limits his unit on the solar system to characteristics of each of the nine planets.
D) Ms. Polumbo's tenth-grade biology class is engaged in cataloguing the different kinds of grass that grow in the softball field.