Respuesta :
Six (I’m putting this because there is a there is less than 20 characters)
Answer: Hello there! Your answer for this question is option (D).
Step-by-step explanation: The answer is option (D) because there is 10 students that completed 10-19 problems and 8 students that completed 0-9 problems.
10 + 8 = 18
You are Welcome! :)
Mark me as Brainliest! :)
100% Verified