Final answer:
The correct interpretation of a road sign indicating an added lane is to 'Keep Right', meaning the driver should continue in the current lane as an additional lane forms on the right.
Step-by-step explanation:
When encountering a sign that indicates a road merges with another road - added lane to the right ahead, it is important for drivers to understand their responsibilities in order to safely navigate the road. The correct response from the given options would likely be D. Keep Right, assuming that the road design allows for the continuation of travel without merging. This scenario usually means that an additional lane is forming on the right, and as a driver, you're expected to remain in your lane without needing to merge. A situation such as this is commonly encountered in high school driver's education or during driving lessons that prepare for practical driving exams.