To enable Sales Email prompt templates:

Permission Set: Assign the Prompt Template User permission set to the sales team to grant access to use pre-built templates.

Feature Activation: Enable Sales Emails in Salesforce Setup to activate the integration between prompt templates and email workflows.

Option B (Manager permission set): Required for creating/modifying templates, not for usage.

Option C (Data Cloud Admin): Unrelated to prompt template access.

References:

Salesforce Help: Prompt Template Permissions

Specifies that "Prompt Template User" is required to leverage templates in workflows.

Sales Email Setup outlines enabling the feature in Setup.