Safe Attachments for SharePoint, OneDrive, and Microsoft Teams in Microsoft Defender for Office 365 provide an additional layer of protection for files. It also detects and blocks existing files that are identified as malicious in Teams.
Option A is incorrect: Advanced Threat Protection (ATP) is for Microsoft Teams along with SharePoint and OneDrive for business applications that integrate with Team's content management.
Option B is incorrect: Safe links currently are not available for Microsoft Teams, but those can be obtained with ATP safe links plans.
Option C is correct: Safe attachment protection is available to SharePoint, OneDrive, and Microsoft Teams. Safe attachments are a feature designed to improve user security by checking for and detecting malicious attachments by creating policies by global or Security Administrators for tenants.
Option D is incorrect: Conditional access policy (CA) is a policy that controls the user's activity and actions that they can do and cannot do in and outside the organization network.
Reference:
https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/mdo-for-spo-odb-and- teams?view=o365-worldwide