One today equals two tomorrows means that what you can accomplish today is more important than what you have planned tomorrow. Today is now. Do something today if you are able to do it. Tomorrow is not guaranteed. The time that you have in life is limited. You have to accomplish one day at a time without thinking about a tomorrow.
I agree with that because if you don't do what you planned to do today, you will probably never get another day to do it. Life can be very unpredictable and I think you should take one day at a time and live your life to the fullest.
This phrase uses the rhetorical device known as Parallelism. The specific piece "at once...government" is repeated in two parallel clauses and thus qualifies as a parallelism.
The Answer is (B) with understanding
