Answer: A- 3 tubes
Step-by-step explanation: If he used 5/6 tube of brown paint for the first drawing and uses the same amount he would have used a total of 1 and 4/6 tube of brown paint and for the green he used 2/3 of green paint the first time and wants to use the same amount again he would have used a total of 1 and 1/3 tube of green paint so overall he would be using a total of 3 tubes