Are Some Problems with Trying to Know All the Science

are some problems with trying to know all the science you might ever teach?

A) There will be more scientific knowledge by time you teach it that was known when you studied it.
B) Scientific knowledge is changing.
C) Some of what you learned may be replaced by new and different knowledge.
D) There is too much scientific knowledge known for any one person to be able to learn it all.
E) All of the above
F) None of the above