Read the following context and choose the best option to answer the question.
Context: * I looked at an apartment last night with a cheap room which would be awesome if not for the fact of being at the top of six flights of narrow stairs with no lift . That 'll make it hard for whoever to get their stuff up there . Still , for the price and only being a 45min tram ride from the city it 's pretty good . * Internet is being unreasonably slow tonight .
Question: What is not a reason for their slow internet ?
Options: 
A. Computer spyware
B. Many people trying to connect
C. Unknown costs
D. Signal downgrade at new location


C