According to Nägele's rule, what is the estimated date of confinement for a client whose last menstrual period started on December 1?

Nägele's rule is a standard way of calculating the estimated date of delivery (EDD) for a pregnant woman based on her last menstrual period (LMP). To use this rule, one takes the first day of the last menstrual period, adds one year, subtracts three months, and then adds seven days.

Starting with the LMP of December 1:

1. Add one year: December 1 of the following year.

2. Subtract three months: This brings you to September 1 of that same year.

3. Add seven days: This gives you an estimated due date of September 8.

Thus, the correct answer is September 8, which accurately reflects the calculations following Nägele's rule.