Answer:
B. advertise on radio and earn $7,000.
Explanation:
The dominant strategy shall be the strategy that shall be to make efforts in advertisement so that public and the keen customers are aware of the respective brand of their products.
Dominant strategy is followed then both will advertise, accordingly if they both advertise through the television, the profit for both of them shall be less.
In case both advertise through radio both the parties shall earn $7,000 profit each.
They both shall choose this, as they know that the opponent will try to perform good and earn more, accordingly both will put efforts.
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