A.)Only one solution is possible: we must cut our expenses.
B.)only one solution is possible: we must cut our expenses.
C.)only one solution is possible: We must cut our expenses.
D.)Only one solution is possible: We must cut our expenses.
the answer is a: "Only one solution is possible: we must cut our expenses.". generally, the first word after a colon is not capitalized, since it is still part of the same sentence.
