What Hypothesis Did Boehm,et Al

Multiple Choice

What hypothesis did Boehm,et al.develop after testing mice (initially) and eventually humans?

A) Because endostatin works on endothelial cells, natural selection for resistance may arise in tumor cells not initially killed.
B) Because endostatin works on tumor cells, natural selection for resistance will not occur in endothelial cells.
C) Because cyclophosphamide works on endothelial cells, natural selection for resistance will not occur in tumor cells.
D) Because cyclophosphamide works on tumor cells, natural selection for resistance will not occur in endothelial cells.