Explanation:

- The pie chart represents the 80,000 people distributed across cities A, B, C, D, and E.

- City B and City D's combined population forms a certain angle in the pie chart.

- Each city’s angle can be calculated as \( \frac{\text{Population of City}}{\text{Total Population}} \times 360 \).

- If City B and City D together form \(x\%\) of the total, then their total angle is \( \frac{x}{100} \times 360 \).

- *Option 1: 135°* - This would mean B and D together account for \( \frac{135}{360} \times 100 = 37.5\%\) of the population.

- *Option 2: 150°* - This represents \( \frac{150}{360} \times 100 = 41.67\%\) of the total population.

- *Option 3: 126°* - This corresponds to \( \frac{126}{360} \times 100 = 35\%\) of the total.

- *Option 4: 162°* - This calculates to \( \frac{162}{360} \times 100 = 45\%\) of people.

- * Option 5: 144°* - This equals \( \frac{144}{360} \times 100 = 40\%\).

; City B and D together must account for 40% of the total.