At a company with an informal, or unwritten, dress code, which of these is the best way to find out how to dress? a. read the company handbook b. look on the website c. observe how others dress d. dress how you want

Best answer is C) Observe how others dress. 

SInce the dress code is unwritten, you won't find it in the company handbook or the website. Dressing how you want is a very "millennial" thing to do, but it might not score you any points at the office. The safest bet is to observe how others dress to get an idea of the expectations. 

I agree with him the answer is C

hope this helps