**A**

**Answer: E =172.932 μm**

**Step-by-step solution:**

When E is located at point (-40, -20)

According to Pythagoras’ theory, the displacement of E from its point of origin = √(40² + 20²) = 44.721 μm.

Total distance travelled = AB + BC + CD + DE.

Using Pythagoras’ theorem again,

AB = √(100 + 2500) = 50.9902 μm

BC = 10 μm

CD = √(100 + 1600) = 41.231 μm

DE = √(2500 + 2500) = 70.7107 um

Total displacement of E =172.932 μm

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