Which sentence is capitalized correctly?
only one solution is possible: We must cut our expenses.
only one solution is possible: we must cut our expenses.
Only one solution is possible: we must cut our expenses.
Only one solution is possible: We must cut our expenses.
only one solution is possible: We must cut our expenses.
only one solution is possible: we must cut our expenses.
Only one solution is possible: we must cut our expenses.
Only one solution is possible: We must cut our expenses.