The answer is "What skills do you feel are your strongest?" Milady lists this exact question in its interview-preparation section as one candidates should anticipate and reflect on ahead of time.
The other three choices aren't just wrong — the book flags language, citizenship-status phrasing, and age as categories of questions that raise legal concerns in an interview setting. Only lawful, job-relevant questions like the one about strengths are the kind the book presents as typical and appropriate.
Milady Standard Barbering, 6th ed., Ch. 19 (Preparing for Licensure and Employment), p. 726: "What skills do you feel are your strongest?"
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