**Maria is using a meter stick to determine the height of a door. If the smallest unit on the meter stick is centimeters, which measurement could Maria have used to most accurately record the height of the door?**

A. 2.309m

B. 2.3m

C. 2.31m

D. 2m

Let’s break down the process of determining which measurement Maria could most accurately use to record the height of a door using a meter stick that measures in centimeters. We’ll consider each of the given options (A, B, C, and D) one by one.

### Understanding the Measurement Scale

The meter stick measures in centimeters (cm), which means:

- 1 meter (m) = 100 centimeters (cm)
- Therefore, the smallest unit Maria can accurately measure is 1 cm.

### Analyzing Each Option

#### A) 2.309 meters

- This translates to 2.309×1002.309×100 cm = 230.9 cm.
- A meter stick marked in centimeters cannot accurately measure to a tenth of a centimeter. Therefore, this measurement is too precise.

#### B) 2.3 meters

- This translates to 2.3×1002.3×100 cm = 230 cm.
- Maria can accurately measure to the nearest centimeter, so this measurement is possible and accurate.

#### C) 2.31 meters

- This translates to 2.31×1002.31×100 cm = 231 cm.
- Similar to option B, this measurement is also possible and accurate to the nearest centimeter.

#### D) 2 meters

- This translates to 2×1002×100 cm = 200 cm.
- This measurement is also accurate and possible with a meter stick marked in centimeters.

### Conclusion

Since a meter stick marked in centimeters can measure accurately to the nearest centimeter, both options B (2.3 meters or 230 cm) and C (2.31 meters or 231 cm) are suitable and accurate. Option D (2 meters or 200 cm) is also accurate but may not capture the full height of the door if it’s taller than exactly 2 meters. Option A (2.309 meters or 230.9 cm) is too precise for the meter stick’s scale and is not feasible.

Hence, **B) 2.3 meters** and **C) 2.31 meters** are the most appropriate choices for Maria’s measurement, as they represent measurements she could accurately make with a meter stick marked in centimeters.