In its ads for athletic shoes, Sleek Feet LLC uses a trademark that is similar, but not identical, to the famous, registered mark of Trend Flash, Ltd. Sleek Feet's unauthorized use of the mark constitutes trademark dilution, provided that

Answer: It might harm the reputation of Trend Flash Ltd. or distinguishing factor is impaired by using similar trademark by Sleek Feet LLC

Explanation:

According to the question, Sleek Feet LLC is using similar or alike trademark for their product (shoes) as well-established corporation, Trend Flash already uses in registered form.

Having similar trademark can confuse consumers as they might not able to identify the difference between the trademark. It can end up purchasing wrong brand shoes rather what they actually intend to

This can tamper the reputation of Trend Flash Ltd. as they have well recognized trademark and difference in quality of shoes be a major factor in it.