Upvote:6
The two questions cover different situations. (b) covers any kind of refusal, denial of entry or deportation for any country. (c) covers all applications but only to Canada.
So if you had previously applied to Canada successfully and followed your visa conditions you would answer NO to (b) and YES to (c). If you had been refused entry to a country other than Canada you would answer YES to (b) but NO to (c).
You would answer YES to both (b) and (c).