Both Advertising and Promotion Are Used to Build Brands

Both advertising and promotion are used to build brands.For which of the two is it easier to measure effects that estimate contribution to sales, and why?

A) Advertising, because memory of ad imagery is simple to measure
B) Promotion, because statistical models can isolate the effect of the promotion
C) Advertising, because consumer recall of taglines is unusually high
D) Promotion, because responses can be specifically identified and tracked