Possible Clues:

• “Obviously!”
• ''Sure, now that you've told me!''
• “It’s obvious!”
• "How obvious"
• 'How obvious'
• ''What an oaf I am!''
• Verbal facepalm
• “Gee, ya think?!”
• 'Obviously, Sherlock!'
• 'Well, ___!' ('It's so obvious!')