A group of students decided to study the sinusoidal nature of tides. The depth of the water level was recorded at various times. At t = 2 hours low tide was recorded at a depth of 2 m. At t = 8 hours, high tide was recorded at a depth of 4 m. What was the depth of the water at time t = 5?

A. 4 m
B. 3.5 m
C. 2.5 m
D. 3 m