Read the following article and answer the question by choosing from the options.

They were nothing but helpful and polite , such a nice surprise . I ' m going back today to place product and do finishing touches . I 'll be back next week - hopefully with stories ! Have a great weekend !

What is the reason I was surprised by them being helpful and polite ?

I. They were playing a trick to surprise me .;
II. They were being nice just to trick or surprise me into thinking they were nice .;
III. They were playing a role , like in a play .;
IV. It is expected that when someone helps or works they will be withdrawn or unhelpful .;...A:
IV.