Methane CH4
ethane C2H6
propane C3H8
Butane C4H10
pentane C5H12
The distance that jet covered in 10 min is 125 Km
calculation
distance = speed x time
speed=750 km/h
time= 10/60hrs
=750 x10/60=125 Km
I would expect silane because all the rest have an overall dipole movement
I think D, not sure though!