Choose the idiom that means "to achieve success without any obstacles or difficulties".

The correct answer is Option B (Smooth sailing).

Key Points:
• Concept: Meanings of Common English Idioms.
• Explanation: 'Smooth sailing' means easy, unimpeded progress or achieving success without encountering difficulties or obstacles.
• Other Idioms:
• 'Have an axe to grind': To have a private, selfish motive.
• 'Drop the ball': To make a mistake or fail in a duty.
• 'Barking up the wrong tree': Pursuing a mistaken line of thought or action.
• Official Key: Option 2 ('Smooth sailing') is the official correct answer.
• Key Takeaway: Remember: 'Smooth sailing' refers to easy progress free from obstacles.