Read the following context and choose the best option to answer the question.
Context: 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 !
Question: What is the reason I was surprised by them being helpful and polite ?
Options: 
- They were playing a role , like in a play .
 - They were being nice just to trick or surprise me into thinking they were nice .
 - They were playing a trick to surprise me .
 - Often when people work they become sullen or reluctant to be pleasant .


Often when people work they become sullen or reluctant to be pleasant .