The angle between the lines vectors r = (3i + j - 2k) + λ(i - j - 2k) and r = (2i - j - 5k) + μ(3i -5j - 4k) is
A. cos-1\(\left(\cfrac{8\sqrt3}{15}\right)\)
B. cos-1 \(\left(\cfrac{6\sqrt2}{5}\right)\)
C. cos-1 \(\left(\cfrac{5\sqrt3}{8}\right)\)
D. cos-1 \(\left(\cfrac{5\sqrt2}{6}\right)\)