According to a Nielsen study, what percentage of purchase-related conversions happened within an hour of the mobile searches that initiated them?

According to a Nielsen study, what percentage of purchase-related conversions happened within an hour of the mobile searches that initiated them? A) 25% B) 0% C) 50% D) 75% The correct answer is: C) 50%   Read more here: https://techcrunch.com/2013/03/13/google-nelsen-mobile-search/