J Crew, a Catalog Retailer, Makes the Following Service Guarantee

J. Crew, a catalog retailer, makes the following service guarantee in its catalog. "Everything we sell is our own design and our own make and we guarantee it all without reservation. If at any time for any reason you are not completely satisfied with any item, we will make an exchange or refund your payment per your direction". J. Crew's service guarantee is a(n) :

A) Marketing testimonial
B) Implicit service promise
C) Word-of-mouth communication
D) Past experience influencer
E) Explicit service promise