In some cases，different approaches ________ the same scientific problem lead to conflicting theories.

A．to             B．in           C．of           D．for

In some cases，different approaches ________ the same scientific problem lead to conflicting theories.

1. A.
   to
2. B.
   in
3. C.
   of
4. D.
   for

In some cases，different approaches ________ the same scientific problem lead to conflicting theories.