Final answer:
You should never power load a boat onto a trailer because it poses a safety risk and could cause damage. Staying close to the shore when paddling upstream helps avoid strong currents, while traveling downstream near the middle utilizes the current for easier navigation.
Step-by-step explanation:
Why should you never use a boat's engine to drive it onto a trailer (power load)? The correct answer is C) It poses a safety risk. Power loading a boat onto a trailer can be dangerous as it can cause the boat to move erratically if not done correctly, leading to potential injury or damage. Additionally, using an engine to power load a boat can cause damage to the boat's engine and the trailer due to excessive force and turbulence.
When paddling a canoe upstream, it is advisable to stay close to the shore because the current near the shore is typically slower and weaker compared to the middle of the river. This makes it easier to paddle against the current. When canoeing downstream, staying near the middle can be best because the faster current in the center helps propel the canoe, making the trip less strenuous and quicker.