You interact with a chatbot. It answers you two times with the following phrase: “Sorry, I am not able to find a related topic. Can you rephrase and try again?” 
What are two possible system responses if a bot cannot understand the intent? 
The bot responds with:

Answer options:

A.“You’re welcome!”
B.“One moment. Let me get you more help with: …”
C.“Great! Please rate your experience…”
D.“To connect with a person now, click on the following link: …”
E.“If you’d like to speak to a human agent, let me know at any time.”

Correct Answers: B and D 
When a typical bot cannot understand the user’s intent, it posts: “Sorry, I am not able to find a related topic. Can you rephrase and try again?” (Number 1 and Number 2). After two times of not understanding the user’s input, a chatbot switches to the Escalate topic and posts the following message: “To connect with a person now, click on the following link: …” (Number 3). The Escalate topic is a default system topic that triggers the “End of conversation” node with a “Transfer to agent” option. 

You can have more robust handling of the escalation. Power Virtual Agents provides a Fallback topic. It is an add-on that you can enable on the Settings/System fallback screen. When you add this topic to your bot, as a system topic, you can modify it, call actions from external sources, like Power Automate or Bot Framework. You can also redirect to another topic. 
If you add this topic as is and re-publish the bot, you will see a new message when a bot does not understand: "One moment. Let me get you more help with: <your last input>" (Number 4). This response comes immediately after the first time of the bot`s non-understanding. And then comes the same phrase about connecting to the live person (Number 3) because, by default, the Fallback topic has a Redirect to the Escalate topic. 

Option E is incorrect because this is a standard phrase that the bot uses to start a conversation (Number 5).
All other options are incorrect. 
For more information about the Power Virtual Agents Fallback topic, please visit the below URLs: 

https://docs.microsoft.com/en-us/power-virtual-agents/authoring-system-fallback-topic
https://docs.microsoft.com/en-us/power-virtual-agents/advanced-hand-off