AFR345, departure runway 05, wind 110 at 6 kts, QNH 1010, temper

AFR345, departure runway 05, wind 110 at 6 kts, QNH 1010, temperature 5，dewpoint 3, _______ 600 meters.

A.visibility

B.RVR

C.ceiling

D.elevation

正确答案是B