Which word can best describe the author's attitude towards the research of cancer

A．There will be a drastic rise in the five-year survival rate of skin-cancer patients.
B．Ninety percent of the skin-cancer patients today will still be living.
C．The survival statistics will be fairly even among patients with various cancers.
D．There won't be a drastic increase of survival rate of all cancer patients.

A．They are always in operation in a healthy person.
B．They remain unharmful so long as they are not activated.
C．They can be driven out of normal cells.
D．Normal cells can't turn them off.