How to show content using OR conditions?

Yes.
Using a Conditional Trigger: Create a single trigger with multiple versions. If-So evaluates the conditions in order (from top to bottom, starting with version A) and displays the first version whose condition is met.
Using Conditional Elements / Blocks: Duplicate the conditional element or block and set a single condition for each version. If multiple conditions could be met at the same time, use a Conditional Trigger instead.