You buy one XYZ January 210 call contract and one XYZ January 210 put contract. The call premium is $14.50 and the put premium is $14.00. Your highest potential loss from this position is...

Since you are long, the most you could lose is what you paid. This would only happen if the stock was exactly $210/share at expiration. Any other higher or lower price would be a smaller loss, or a profit, the answer isn't 28.50.