Which statement correctly describes the data shown in the graph and the type of observation used? a. The gingko 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.