Which head uses 25% of the funds?

From the pie chart,

Percentage of School fund spent on Sports = $$\frac{120^{\circ\ }}{360^{\circ\ }}\times100=33.33\%$$

Percentage of School fund spent on Art and Craft = $$\frac{90^{\circ\ }}{360^{\circ\ }}\times100=25\%$$

Percentage of School fund spent on Library = $$\frac{60^{\circ\ }}{360^{\circ\ }}\times100=16.67\%$$

Percentage of School fund spent on Misc = $$\frac{30^{\circ\ }}{360^{\circ\ }}\times100=8.34\%$$

$$\therefore\ $$Art and Craft uses 25% of the school funds

Hence, the correct answer is Option B