I need help with math

In ABC, points D and E are the midpoints of  and  respectively. What are the slope and length of  , if the slope and length of  are 0.5 and 3.2 units, respectively?

a) slope = -2, length = 3.2 units

b) slope = 0.25, length = 3.2 units

c) slope = 0.5, length = 1.6 units

d) slope = -2, length = 1.6 units

e) slope = 0.25, length = 1.6 units