Which types of hooks can import classes from the plugin class loader?

The choice related to auto login hooks is correct because auto login hooks utilize the plugin class loader to import classes. This capability allows them to access the broader range of classes packaged within the plugin from which they operate. Auto login hooks are particularly designed to integrate external authentication mechanisms or processes, and they achieve this by leveraging the classes available to them in the plugin context.

The other types of hooks listed do not employ the plugin class loader in the same way. Language hooks primarily deal with language definitions and translations, which are not dependent on the broader class structure used in auto login. Cache management hooks focus on controlling caching behavior and typically interact with Liferay's core services directly, rather than utilizing the plugin class loader. Theme hooks are specialized for modifying themes and do not typically involve importing classes beyond what is necessary for styling and layout purposes.

Thus, auto login hooks stand out due to their functional design and dependency on classes that enhance authentication processes, making them the only option that correctly relates to usage of the plugin class loader.