Look at the graph below, which shows the results of a survey about antibiotic resistance in bacteria.


Which question will most likely be investigated based on these results?

AHow long do the bacteria live when they are not exposed to antibiotics?

BHave bacteria always been resistant to antibiotics?

CIs S. aureus weaker than E. faecium?

DDo certain cell structures promote resistance in E. faecium?

I know it's not B, but is It D