Option D: $72^\circ$
The full angle at the centre is $360^\circ$. Dividing equally among 5 sectors: $360^\circ \div 5 = 72^\circ$.
The total angle around a point is always $360°$. For n equal sectors, each central angle = $360° \div n$. Here, $n = 5$, giving $72°$. Students often confuse this with common angles like $60°$ or $90°$, so remember to divide $360°$ by the actual number of sectors.