According to a December 4 hospital census of 100, what are the total inpatient service days for December 5?

Question

Admissions 10
Discharges 2
A & D 1

A. 90 C. 100
B. 109 D. 110

Total inpatient service days are the total number of services received by all inpatients on each day in a period (which is also the same number as the daily inpatient census).

So my answer is C, is that right? Thx a lot for y'all help.