"In the Long Run, We're All Dead" Was Keynes' Way

"In the long run, we're all dead" was Keynes' way of saying that:

A) output eventually returns, but too slowly, to its natural level.
B) there is no point in saving for retirement.
C) intellectual pursuits, like understanding the economy, are unimportant in the scheme of things.
D) no one would appreciate his theories during his lifetime.
E) it is very important to save for one's retirement.