(A) I only (B) II only (C) III only
(D) I,II,III (E) none
What KNOWLEDGE must middle/secondary students have to solve this? In what grade is this taught?
Ask students: If "could" was replaced by "must" would the answer change? Explain.
For homework, ask students to write their own version of this problem. You may get some awesome questions you can use later on!
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