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Explanation:

It can be seen that if the length of the rope is 8 m, then the cow will be able to graze an area equal to (the area of the circle with radius 8m) – (Area of the sector of the same circle with angle 30°) = π(8)² - 30360π(8)2

= 64π - 112 (64π) = 64π 1112 = 176π3 sq.m

Shortcut:
Area grazed without restriction is 64π m2 it should  be less than 64π sq.m. with restriction. So choice (d).

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