Answer:
C. Ankur found that the quotient of a positive number and a negative number is positive
Explanation:
Given the expression that is solved by Ankur as shown;

We were told that Ankur got 3. Let us evaluate to see ankurs error.
change to improper fraction first

Note that from the calculation the quotient of a positive number to a negative number returns a negative number. Based on Ankur's answer, he got a postive value which is one of his errors. He found out that the quotient of a positive number and a negative number is positive which is wrong.
Hence the correct option is C