Your answer would be Two.
Know, because know is present tense as is the rest of the sentence.
Answer:
Option C) Mixed problems
Explanation:
Because the problem is not specified, it is likely that the assignment belongs to a different category.
Answer:
1: Taking a sentence from a book and not stating the author.
2: Copying someones essay or test.
3: Taking a definition from Wikipedia and not stating that you got it from Wikipedia.