In the Salesforce Lightning Component framework, there are two phases for application event propagation: **Default** and **Bubble**. Therefore, the correct answers are:

B. Default

C. Bubble

### Explanation:

1. **Default Phase**:
- This is the initial phase where the event is handled by the components that directly registered an event handler for the specific event type. Handlers that are registered in the default phase get the first opportunity to handle the event.

2. **Bubble Phase**:
- After the default phase, the event enters the bubble phase. In this phase, the event starts at the source component and bubbles up through the component hierarchy. This allows parent components to handle the event, providing an opportunity for higher-level components to respond.

These phases allow for a structured and manageable way to propagate events and handle them appropriately within the component hierarchy.

So, the correct choices are:
B. Default
C. Bubble

The correct answer choices from the provided list are:

**B. Default**
**C. Bubble**

**Reason:**
- **B. Default** - While "Default" isn't strictly a named phase in the Salesforce event propagation model, it can be related to how events are handled by default in the absence of explicit intervention. However, using "Default" in the context of event phases might be misleading since it's not a formal term used in Salesforce documentation for event phases.

- **C. Bubble** - The "Bubble" phase is traditionally known in many web frameworks as part of event propagation, where an event moves up from the target component through its ancestors. In Salesforce, this concept applies only to component events, which can propagate from a child component up to its parents unless the propagation is explicitly stopped. It's important to note, however, that application events in Salesforce do not follow this bubble mechanism; they are handled by any component that listens for them regardless of the component hierarchy.

It's crucial to understand that while "Bubble" is a legitimate phase in general web development and for Salesforce component events, it does not apply to Salesforce application events, which behave differently. The terminology might be included in options to check understanding of these distinctions....