Final answer:
Large, rectangular bales are most efficient for long-distance transport because their shape allows for better stacking and space maximization on trucks, in contrast to small, rectangular bales or large, round bales. Thus, the option b is the correct answer.
Step-by-step explanation:
The efficiency of long-distance transport of hay largely depends on the method of baling. Large, rectangular bales are typically more efficient for long-distance transport than small, rectangular bales or large, round bales. Large rectangular bales have a uniform shape that makes them easier to stack and secure on a truck, maximizing the space available and reducing the number of trips needed for transportation. Whereas the large, round bales, despite the potential for higher individual weight, may not stack as efficiently due to their shape, leading to wasted space. Small, rectangular bales, while easier to handle, require more trips for the same amount of hay due to their smaller size.