Two Alternative Investments Require the Same Cash Outlay

Two alternative investments require the same cash outlay. Their net cash returns are as follows:
ALTERNATIVE A: $20,000 each year for five years beginning one year from now.
ALTERNATIVE B: $10,000 each year for 11 years beginning one year from now.
If money is worth 20% compounded annually, which investment alternative should be chosen? What is the size of the current economic advantage of the preferred alternative?

A) Alternative A by $7887.52
B) Alternative A by $16,541.64
C) Alternative B by $7887.52
D) Alternative B by $16,541.64
E) Alternative B by $10,000.00