In view of the worsening environment, the local government is seeking advice from Professor Smith, who is an expert ______ it.

In view of the worsening environment, the local government is seeking advice from Professor Smith, who is an expert ______ it.

1. A.
   within
2. B.
   for
3. C.
   on
4. D.
   beyond

In view of the worsening environment, the local government is seeking advice from Professor Smith, who is an expert ______ it.

A. within          B. for          C. on          D. beyond

In view of the worsening environment, the local government is seeking advice from Professor Smith, who is an expert ______ it.