You are adding a new entry to the backend menu that appears after Marketing > SEO & Search > Site Map You see the existing site map menu item is declared by the node:
A. Specify item XML in the file etc/adminhtml/menu/marketing/seo/menu.xml
B. Specify parent=”Magento_Sitemap::catalog_sitemap”
C. Specify parent=”Magento_Backend::marketing_seo”
D. Specify sortOrder=”100″
not sure
