Question

(1) As soon as Loraine arrived in town, she phoned Dee. (2) However, Dee was not home. (3) Discouraged, by this Loraine walked four blocks to a coffee shop. (4) She hoped Darlene her old friend would be there. (5) When she got to the coffee shop, Loraine found that Darlene was not there. (6) Loraine asked one of the waitresses where Darlene was, and she learned that Darlene had moved to Delaware. In which sentence is the comma used incorrectly?

Answer 1

In sentence 3. It should be 
Discouraged by this, Loraine walked four blocks to a coffee shop.