Yes, answer (A) is correct.
Please refer to "Table 2" within this article: https://www.cisco.com/c/en/us/td/docs/security/firepower/623/configuration/guide/fpmc-config-guide-v623/dashboards.html
Table 2. Custom Analysis Widget Preferences
The following items are required:
- Table (required): The table of events or assets that contains the data the widget displays.
- Field (required): The specific field of the event type you want to display. To show data over time (line graphs), choose Time. To show relative occurrences of events (bar graphs), choose another option.
- Aggregate (required): The aggregation method configures how the widget groups the data it displays. For most event types, the default option is Count.