A Muslim should respond by:

1. **Assessing the level of uncertainty (gharar)**: Determine if the investment involves excessive risk or speculation, which is prohibited in Islam.
2. **Consulting a knowledgeable Islamic scholar or financial advisor** to evaluate the investment’s compliance with Islamic principles.
3. **Ensuring the investment is free from haram (forbidden) elements**, such as riba (interest) or unethical activities.
4. **Avoiding the investment** if it does not fully align with Islamic teachings.