Option 2 : 20°

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**Given:-**

AB ∥ EF

**Concept:-**

If lines are parallel then alternate interior angles are equal.

∴ ∠BDC = ∠ECD

**Solution:-**

∠BDC = ∠ECD

⇒ 4x + 15° = 6x – 25°

⇒ 6x – 4x = 25° + 15°

⇒ 2x = 40°

**∴ The value of x is 20°**

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