| Answer: C |
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| The value of \(x\) is: |
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| \(\begin {aligned}\angle DEF+75\degree&=180\degree\\\angle DEF&=180\degree-75\degree\\\angle DEF&= 105\degree.\end{aligned}\) |
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| The opposite angles in a parallelogram are the same, then: |
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| \(\angle DEF= \angle DGF= 105\degree.\) |
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| Vertically opposite angles are the same, then: |
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| \(\angle HGJ= \angle DGF= 105\degree.\) |
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| The opposite angles in a parallelogram are the same. |
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| \(\angle HKJ = \angle HGJ= 105\degree.\) |
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| Then, the value of \(x\) = \(105\degree.\) |