noboru
Because of the business community’s uncertainty about the President’s position
in regard to the issue of the budget deficit, an unanticipated rise in interest rates has occurred.
(A) in regard to the issue of the budget deficit, an unanticipated rise in interest rates has
(B) on the deficit, an unanticipated rise in interest rates has
(C) regarding the budgetary deficit, an unanticipated rise in interest rates have
(D) on the deficit, an unanticipated rise in interest rates have
(E) regarding the deficit, an unanticipated rise in interest rats have
E can be eliminated since no one is interested in rats.
C, and D can be eliminated because "have" is the incorrect in this context
A is extremely wordy
B is just right, and addresses the concerns seen early "interest rates" not "rats", and uses "has"