【单选题】

It can not be denied that the existing resources on earth will be depleted, but scientists are ------- to concede the inevitability of that day, ------- that new energies can be found in the near future.
A．(A) bound... assuming

B．(B) unprepared ... skeptical
C．(C) hesitant... convinced
D．(D) likely... realizing
E．(E) eager ... hypothesizing