The correct answer is A: Atmospheric noise is so high that directivity is much more important than losses. For 160- and 80-meter receiving antennas, it's generally true that atmospheric noise is so high that directivity is much more important than losses. The high noise floor means signal-to-noise ratio is the limiting factor, not losses. On 160 and 80 meters, atmospheric noise (from lightning, etc.) is very high - often the dominant noise source. This high noise floor means that even if your antenna has some losses, the signal-to-noise ratio is primarily determined by how well the antenna rejects noise from unwanted directions (directivity), not by the losses themselves. A directional antenna that rejects noise from most directions is much more valuable than a lossless omnidirectional antenna that receives noise from all directions. This is why Beverage antennas and other directional receiving antennas are popular on these bands.