Not sure why the answer is B. All we know is that Q is before R and T, so wouldn't R and T be interchangeable? In other words, it COULD be true that the last of the three site visits includes R, but it's not a must because we can switch R and T.
Just wanted to add my 2-cents here. B versus E.. I was stumped, and I ended up choosing B. However, upon review, I realized why E was the better answer. Choice B calls into question familiarity. However, in the Manager's argument it says "while their employees CAN ALL USE THE NEW SOFTWARE, unof...