**Core Concept**
The measurement of uterine activity is crucial in obstetrics, particularly during labor. Montevideo units (MUs) are a quantitative measure of uterine contractions and are used to assess the effectiveness of labor.

**Why the Correct Answer is Right**
Montevideo units are calculated as the sum of the product of the peak uterine pressure and the duration of each contraction, expressed in centimeters of mercury (cmH2O) multiplied by minutes (min). This calculation provides a comprehensive assessment of uterine activity, taking into account both the intensity and duration of contractions. The correct answer is the unit that accurately represents this calculation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately represent the calculation of Montevideo units. The correct formula involves the product of peak uterine pressure and contraction duration.
**Option B:** This option is incorrect because it does not include the duration of contractions in the calculation, which is a critical component of Montevideo units.
**Option C:** This option is incorrect because it does not accurately represent the calculation of Montevideo units. The correct formula involves the product of peak uterine pressure and contraction duration, not just the peak pressure.

**Clinical Pearl / High-Yield Fact**
It is essential to note that a Montevideo unit score of 200 or more is generally considered a good indicator of effective uterine contractions during labor. This can help guide obstetricians in making informed decisions regarding labor management.

**Correct Answer: C. The sum of the product of the peak uterine pressure and the duration of each contraction, expressed in centimeters of mercury (cmH2O) multiplied by minutes (min).**