Why do thorny bushes present a special problem regarding rodents?

Thorny bushes create a specific challenge for managing rodent populations primarily because they offer rodents a safe and sheltered environment. The dense and spiky structure of these bushes provides rodents with essential cover and protection from predators, allowing them to hide and establish nests within the thorns. This not only increases their chances of survival but can also facilitate their reproduction in areas where they might otherwise be vulnerable.

While certain bushes might attract insects, the primary concern with rodents is their ability to find refuge. The idea that these bushes are complicated to plant or that they grow excessively large does not directly relate to the issue of rodent access and population control. Hence, the nature of thorny bushes as protective habitats for rodents is what makes option B the correct answer.