A third-party module uses a layout update that changes the template path for a core block from product/view/addto/compare.phtml of the Magento_Catalog module to custom/view/addto/compare.phtml of your custom module. The merchant has a customized version of this template in their custom theme.
A. If the custom module is removed, the custom template will no longer apply
B. This setup will throw an IllegalStateException
C. If a preference for the core block is set, the template will no longer apply
D. If another module is installed which also customizes the same core template, the templates will be rendered sequentially