No Left Turn

Correct answer: The action shown in the picture is not allowed

A red circle with a slash means the action pictured inside is prohibited.

Source: Section 7: Laws and Rules of the Road – Signs

Correct answer: The action shown is not allowed

The red circle with a slash is the NO symbol: whatever is pictured inside is prohibited.

Source: Section 7: Signs, Signals & Markings – Regulatory Signs

Correct answer: No; a U-turn counts as two left turns

Virginia considers a U-turn to be two left turns, so a U-turn is illegal wherever a No Left Turn sign is posted.

Source: Section 2: Signals, Signs and Pavement Markings – Traffic Signs