The Figure Shows Results of a Study Where Pine Trees

The figure shows results of a study where pine trees were treated with fungal mycorrhize to determine if the mycorrhize would affect the growth of the trees. Over the four-year study, only 36% of the control trees survived, while 85% of the pines treated with mycorrhizae survived. If the study was extended for another two years to the year 1961, what would you predict would occur with the control data and mean height of the pine trees?

A) The control data would show a steep drop in mean height.
B) The control data would continue to show a slight increase in height.
C) The control data would show a steep increase in mean height.