Mr. Grant wants his fourth-grade math students to learn to work collaboratively, to discuss alternative approaches to solving tasks, and to justify their solutions. Students are grouped in pairs and Mr. Grant gives his students the following task.
Express the ratios below in the lowest forms:
15/25, 18/6, 9/36, 18/15.
Which of the following best describes the level of student engagement expected with the given task?

A. It will further students' ability to think or reason about important ideas associated with ratio and proportion.
B. It will promote rich and enlightening communication about mathematics, but leaves little room for collaborative work.
C. It will stimulate students to make conjectures and present solutions collaboratively.
D. It will not engage students in high level forms of thinking.