ANSWER
D. 32 m
Step-by-step explanation
We have that the scale of the drawing to the actual lighthouse is 1 cm : 4m.
This means that 1 cm on the drawing represents 4 m in real life.
Converting 4 m to cm (1 m equals 100 cm):
4 m = 400 cm
So, the scale is:
1 cm : 400 cm
This means that to get the actual height of the lighthouse, we have to multiply the length in the drawing by 400.
So, we have:
8 cm * 400 = 3200 cm
Converting this back to metres:
3200 / 100 = 32 m
Therefore, the actual height of the lighthouse is 32 m.