A concurrent power is one that is shared by both the federal government and the state governments. Among the options you've provided, the correct description of a concurrent power is:
the power to issue licenses
Both state and federal governments can regulate and issue certain types of licenses. The other options describe powers that are specific to either state or federal government. For example, the power to regulate interstate trade is primarily a federal power, the power to borrow money can be exercised by both, but it is not typically categorized explicitly as a concurrent power, and the power to declare war is reserved for the federal government.