This graph shows how tall five types of trees were after they grew for 10 years.
which statement correctly describes the data shown in the graph and the type of observation used?

a. the ginkgo tree grew 14 feet; this is a qualitative observation.
b. the bur oak tree’s growth rate averaged 2.5 feet per year; this is a quantitative observation.
c. the bur oak tree is twice the height of the ash tree; this is a qualitative observation.
d. the norway spruce grew more slowly than the sycamore every year; this is quantitative data.