Cancer-Fighting Drugs Are Usually Given in Combination to Target Several

Multiple Choice

Cancer-fighting drugs are usually given in combination to target several different stages of the cell cycle.Which statement best explains why this might be a better approach than use of a single drug?

A) Cancers often have multiple mutations in different cells of the tumor, and some of these mutations might affect different parts of the cell cycle.
B) A single drug approach might not pick the correct drug on the first try, so trying many at once saves time.
C) Cancer-fighting drugs are not very potent, so many are needed at the same time.
D) Cancer cells constantly change, and multiple drugs can overcome those changes.
E) None of the above; this is not a better approach and is not well thought out.