The expression used on the internet to greet someone returning to a conversation is 'WB', meaning 'Welcome Back'. This abbreviation is widely recognized in informal digital communication. The other options do not represent common greetings.
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In conversations on the internet, people often use abbreviations and acronyms to communicate quickly and efficiently. When someone returns to a conversation, you might greet them warmly or acknowledge their return. One common expression used is 'WB', which stands for 'Welcome Back'.
Here's how it breaks down:
'WB' (Welcome Back): This expression is used to greet someone who has returned to a conversation or online platform after being away for a while. It's a friendly way to acknowledge the person's return and show that you noticed their absence.
None of the other options ('YB', 'UB', 'XB') are commonly recognized expressions for welcoming someone back in common internet slang.
Therefore, the correct choice in this context is option C) WB .