Answer: "D"
Step-by-step explanation: 5 and 2/3 is already a mixed number so we leave it how it is. Now we just have to write 5 and 2/3 as an improper fraction.
To write a mixed number as an improper fraction, first multiply the denominator by the whole number and then add the numerator. Finally, we put our new number over our original denominator.
Therefore, 5 and 2/3 can be written as the improper fraction 17/3.