Need help with this math. It’s either C or D? Please help

C
From my sources, it seems that each sine function's curve repeats itself. Or another word, "periodicity". The length for the sine and cosine curves is 2π. So I think it is C because the option says how "The cycle repeats every πradius."
I hope this helps!! If it isn't right I'm really sorry, tell me and I can correct it. Have a nice day. Also, sorry to ask but if someone else ever answers can you mark me as brainliest? I'm trying to go up a rank. Thank you.