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1. $\sqrt{60} + \sqrt{15} - \sqrt{135}$

A. $0$
B. $0$
C. $0$
D. $0$

Answer: Option A

Explanation:

✓(60) + ✓(15) - ✓(135)

= ✓(4×15) + ✓(15) - ✓(9×15)

= 2✓(15) + ✓(15) - 3✓(15)

= 3✓(15) - 3✓(15)

= 0.

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