A - https://help.salesforce.com/s/articleView?id=sf.creating_flexipage_tabs.htm&type=5

C. Lightning record page.

Explanation:
To display Account Details, related list and chatter feeds on separate tabs, the administrator should create a Lightning Record Page.

Lightning Record Pages are used to customize the user interface and layout of standard and custom object records. The administrator can add and configure components to display the desired information, including related lists, chatter feeds, and account details. By creating separate tabs on the record page, the user can easily navigate between the different sections of the account information.

Lightning Page Tabs are used to create custom tabs for custom Lightning Pages. Lightning Page Components are used to add functionality to custom or standard Lightning Pages. Lightning App Pages are used to create custom app pages in Lightning Experience.

However, in this scenario, the administrator wants to customize the layout of a standard object (Account) record, which can be achieved by creating a Lightning Record Page.

Documentation says you can create Lightning page tab so idk https://help.salesforce.com/s/articleView?id=sf.creating_flexipage_tabs.htm&type=5

can someone explain why this is A

Definitely C, there are only 3 types of pages: Record Page, App Page and Home Page...

Maybe C?