Stacey's Client Group Has Been Gradually Shrinking and She Is

Stacey's client group has been gradually shrinking and she is looking for new prospective clients. She has decided to spend a couple of days approaching potential customers without any prior consent. Stacey's method of approach is known as

A) referral approach.
B) ambulance chasing.
C) door-to-door selling.
D) cold canvassing.
E) repeat contact.