If you walk 1.4 km north and then 4.8 km east, what are the magnitude and direction of your resultant displacement?
A - magnitude: 5 km; direction: 16.3° east of north
B - magnitude: 5 km; direction: 73.7° east of north
C - magnitude: 4.6 km; direction: 73.7° east of north
D - magnitude: 4.6 km; direction: 16.3° east of north