Median of 3, 5, 7.

**The reasoning** The **median** is the middle value when numbers are arranged in order. Think of it as the "center position" in a lineup. Your numbers: 3, 5, 7 They're already arranged from smallest to largest. Count them: there are **3 numbers** total. For an odd number of values, the median is simply the one in the middle position. Position 1: **3** Position 2: **5** ← This is the middle! Position 3: **7** So the median = **5** **Why the wrong options tempt you** - **A (3)** and **C (7)** are the endpoints. Students sometimes confuse median with "first" or "last" value. - **D (9)** might trick you if you accidentally added something (like 3+5+7 = 15, then made an error). The median isn't about addition at all—it's purely about *position*. **Quick takeaway** Median = middle value when arranged in order; for odd-numbered sets, it's literally the center number—count to the middle and pick it!