B

PPV = True Positives / (All Positive Tests).  
True positives = 0.95 × 2 000 = 1 900; false positives = (1 – 0.80) × 8 000 = 1 600.  
PPV = 1 900 / (1 900 + 1 600) ≈ 0.5429 → 54.3%.