A man walks eastwards a distance of 4.0 km and then moves northwards a distance of 3.0 km.
Which of the following statements correctly describes the overall displacement of the man?
a. 7 km in a direction that is 53∘ north of eastwards
b. 7 km in a direction that is 37∘ north of eastwards
c. 5 km in a direction that is 37∘ north of eastwards
d. 5 km in a direction that is 53∘ north of eastwards