The correct answer is "I have one problem with the ski trip this weekend: I can’t ski!". A colon means "that is to say" or "here's what I mean." Colons and semicolons should never be used interchangeably. There are three main uses of the colon:
to introduce a list
before a quotation, and sometimes before direct speech
between two main clauses in cases where the second clause explains or follows from the first
Yes he does. Money only matters to Gatsby because he thinks it will help him win Daisy back. An easy one-liner about money not buying happiness doesn't apply to Gatsby. Daisy will bring happiness to Gatsby, nothing else