The correct answer is B. Regulate trade between the states.
Concurrent powers are powers that are shared by both the national government and state governments.
Among the options given, an example of concurrent powers is B. Regulate trade between the states.
This means that both the national government and state governments have the authority to make and enforce laws related to trade and commerce between states.
It allows them to establish regulations, standards, and policies to ensure fair and orderly trade practices among the different states within the country.
By having concurrent powers in this area, both levels of government can work together to promote economic stability and consistency in interstate trade.