Final answer:
The total number of pieces of candy in the bowl is 18, which is the sum of the individual counts of red, orange, and green candies.
Step-by-step explanation:
The total number of pieces of candy in the bowl is the sum of the pieces of each color. The bowl contains 8 red, 6 orange, and 4 green candies. To find the total, we just need to add these numbers together: 8 (red) + 6 (orange) + 4 (green) = 18 pieces of candy in total. Therefore, the correct answer is option 3) 18.