## Core Concept
Naegele's rule is a method used to estimate the due date (EDD) of a pregnancy. It assumes a 28-day menstrual cycle with ovulation occurring on day 14. The rule adds 7 days to the first day of the last menstrual period (LMP) and then adds 9 months.

## Why the Correct Answer is Right
To calculate the EDD using Naegele's rule for a patient with LMP 9/1/2017, we follow these steps:
- Start with the first day of the LMP: 9/1/2017
- Add 7 days to the first day of the LMP: 9/8/2017
- Add 9 months to this date: 6/8/2018
So, the EDD according to Naegele's rule for a patient with LMP 9/1/2017 is 6/8/2018.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not accurately reflect the calculation based on Naegele's rule.
- **Option B:** This option is incorrect because it also does not accurately reflect the calculation based on Naegele's rule.
- **Option D:** This option is incorrect because it does not match the correct EDD calculated using Naegele's rule.

## Clinical Pearl / High-Yield Fact
A key point to remember is that Naegele's rule assumes a regular 28-day menstrual cycle. Variations in cycle length can affect the accuracy of the estimated due date. For cycles longer than 28 days, the due date may be later than estimated, and for shorter cycles, it may be earlier.

**Correct Answer: C. 6/8/2018.**