What may be Professor Jardine's attitude towards the craftsmen working for very little money

A．The general theory of relativity makes more accurate prediction of the motion of Mercury than the theory of gravity.
B．It is much simpler to work with the theory of gravity than with the general theory of relativity.
C．The general theory of relativity evolved from the theory of gravity.
D．The general theory of relativity is used for scientific research while the theory of gravity is used for all practical purposes.

A．It doesn't work to investigate a problem.
B．Everything is so intertwined that it's hard to break a problem up into bits.
C．The sum of the partial theories may disagree with the full solution to a problem.
D．They have not been proved as scientifi