Answer:
b. Try to swim over to the tree.
Step-by-step explanation:
In this situation, the safest thing to do is try to swim up to the tree and lean on it. This will prevent you from being carried away by the current or sinking. Relaxing your body and letting the current take you can be very dangerous because it can make you drown, you shouldn't try to set your feet on the ground either, because you don't know how deep it is, there may be something on the ground that hurts you and the current can bring you down. Lastly, you should also not dive under the tree, as you may get stuck, be carried away by the current and drown.