Use the Following Information to Answer the Question Which of the Following Conclusions Can Best Be Drawn from a Basidiomycete

Use the following information to answer the question.
Heterobasidion is a basidiomycete that contributes to mortality of trees. Kuhlman isolated 23 strains of Heterobasidion and applied them to 16 seedlings of 10 different tree species. Partial results of this experiment are shown in the table.
% mortality of five host species from five Heterobasidion isolates
$$\begin{array} { | l | l | l | l | l | l | } \hline & \text { Isolate } & \text { Isolate } & \text { Isolate } & \text { Isolate } & \text { Isolate } \\\hline \text { Host } & 63 & 117 & 195 & 126 & 118 \\\hline \text { Slash Pine } & 50 & 69 & 94 & 100 & 94 \\\hline \text { Shortleaf Pine } & 75 & 56 & 94 & 94 & 100 \\\hline \text { Red Cedar } & 38 & 32 & 19 & 50 & 25 \\\hline \text { Yellow-Poplar } 0 & 0 & 0 & 6 & 6 & 6 \\\hline \text { Sycamore } & 0 & 0 & 0 & 0 & 6 \\\hline\end{array}$$
Which of the following conclusions can best be drawn from these results?

A) All tree species are susceptible to Heterobasidion.
B) Heterobasidion strains are equally lethal to all tree species.
C) Heterobasidion strains vary in their effect on tree species.
D) Some strains of Heterobasidion reduce tree mortality.