GKFix MCQ Question

What is the expected major product when but-1-yne (CH₃CH₂CH₂C≡CH) reacts with one equivalent of HBr?

• A. 1-Bromobut-1-ene
• B. 2-Bromobut-1-ene
• C. But-1-ene
• D. 2,2-Dibromobutane