The least count of an outside micrometer is 0.01 mm. The range of the micrometer is 75 to 100 mm. The barrel reading is 15.50 mm and the 10th thimble graduation coincides with the barrel datum line. The reading is

• A. 15.60 mm
• B. 15.06 mm
• C. 15.50 mm
• D. 15.40 mm