One angle of a parallelogram is 60°. Find its opposite angle and the adjacent angle.​

Explanation:

its adjacent angle is 180 - 60= 120⁰

its opposite angle is equals to 60⁰

60 + 60 + x + x = 360 (because opposite angle of parallelogram is equal)

120 + 2x = 360

2x = 360 - 120

2x = 240

x = 240 / 2

x = 120

hence x=120

{here x is adjacent angle}

and the opposite angle is 60 degrees

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i think the answer is d.