Researchers Hypothesized That a North American Fungus Not Only Caused

Researchers hypothesized that a North American fungus not only caused symptoms of white-nose syndrome (WNS) but also caused death.The results from their experiment are shown in the graph below.Based on this graph,which of the following hypotheses would be the MOST logical hypothesis for further studies?

A) "Sham injected" bats have a higher mortality rate than bats that are not injected.
B) Bats injected with the North American fungus are less likely to care for their offspring than "sham injected" bats.
C) Bats injected with European fungus have a lower mortality rate than "sham injected" bats.
D) Other species of bats injected with European fungus will experience death.