Based on my previous Nifty 50 charts this time I tried to explain more with texts and markers on chart. I hope it would help you to understand. This is just my prediction, It could be wrong anytime.
After wave A to B retracement which was almost 0.382 from the previous wave (Must mention that SGX Nifty was 17014 that day, exactly where I pointed out) now the wave C could be 1 to 1.414 (Between 17748 to 18031). But I would say wave C must be not more than 17900,
The yellow box is the sideways box. Dashed lines are all trend lines.
Hope you traders will like it. Thanks for viewing ":-)