Answer:
O A boat made from a single log.
Explanation:
Log boat is the one of the simplest form of boat that can be produced without too much work. It's made by craving a single log in the middle to provide enough space for one or two people to sit in.
This is the type of boat that's most commonly used by native Americans. Dugout Canoe that they often used can be considered as some sort of log boat.
This boat can only be used to travel in a short distance and can only be moved by using mechanical energy from the rows.
