Final answer:
The main idea of the passage is that hexagon-shaped cells are the most efficient for the construction of bee hives, as they require the least amount of work.
Therefore, option B is correct answer.
Step-by-step explanation:
The statement that best describes the main idea of the passage is B. Hexagon-shaped cells require the least amount of work. This is supported by the information provided about the efficiency of hexagonal packing in comparison to square packing when referring to the structure of the honeycomb. The hexagonal lattice is described as a more efficient arrangement since it covers more area with less empty space, which implies that building hexagon-shaped cells in the hive would require the least amount of wax and be the most efficient use of bees' efforts in constructing their hive.