We'll do a little construction here, and for that I'm gonna suppose it's a trapezium.
Join B and D and.
now as you can see in the picture above,
as the line having y and z measured 17 therefore,
y+z = 17
Now,
as the line y is || to AB (I've supposed it's a trapezium)
Therefore,
by mid point theroem,
2(y)=5
y = 2.5
Now, by susbtituting this value in y+z =17
you'll get
2.5 + z = 17
z = 14.5
Now, in triangle BDC
by mid point theorem,
2(z)= x
we already know the value of z so simply substitute it and you'll end up with,
2(14.5) =x
29 = x.
Therefore,
option B is the correct one.
