For the given five values, 15, 24, 18, 33, 42, the three-year moving averages are

19, 25, 31

The correct answer is Option (2) → 19, 25, 31

Given values: 15, 24, 18, 33, 42

Three-year moving average = Average of 3 consecutive values

1st moving average: $\frac{15 + 24 + 18}{3} = \frac{57}{3} = 19$

2nd moving average: $\frac{24 + 18 + 33}{3} = \frac{75}{3} = 25$

3rd moving average: $\frac{18 + 33 + 42}{3} = \frac{93}{3} = 31$

Three-year moving averages: 19, 25, 31