$17,000
Explanation:
The reason is that the recognized gain is the difference between the Carrying Value and the Sale Value of the asset.
Here
Carrying value of asset = $13,000 Cost - $11,000 Accumulated Depreciation
Carrying value of asset = $2,000
Sale Value is $19,000
Recognized Gain = $19,000 Sale Value - Carrying Value $2,000
Recognized Gain = $17,000