Answer:
A. 10 cm
Step-by-step explanation:
You want to know the height of a 1:800 model of an 80 m (8000 cm) giant sequoia tree.
Scale factor
The scale factor of a model or drawing or map is the ratio of a dimension of the model to the corresponding real world dimension. That is, the model dimension is found by multiplying the real world dimension by the scale factor.
model height = 1/800 × tree height
model height = 1/800 × 8000 cm = 10 cm
The model of the sequoia tree would be 10 cm tall.