Two views of the sign at the entrance of a two-story parking lot showing the date, time, and the number of empty parking spaces on each floor are given below.
| 98.05.99 | $22 : 08$ |
| Empty |
| 1st Floor | 92 |
| 2nd Floor | 89 |
It is known that all vehicles entering this parking lot are parked, and the sum of the number of vehicles entering the parking lot and the number of vehicles leaving the parking lot between these two times is 51.
Accordingly, how many vehicles entered the parking lot between these two times?
A) 12
B) 20
C) 28
D) 36
E) 44