Shivering in winter is caused by

Voluntary action of striated muscles

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Voluntary action of unstriated muscles

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Involuntary action of striated muscles

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Involuntary action of unstriated muscles

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Solution

The correct option is C Involuntary action of striated muscles
Shivering is an involuntary action of striated muscles ( skeletal muscles). Shivering is also called rigor or shuddering. It is a bodily function in response to early hypothermia or just feeling cold in warm-blooded animals. When the core body temperature drops, the shivering reflex is triggered to maintain homeostasis. Skeletal muscles begin to shake in small movements, creating warmth by expending energy.
Hence the correct option is C.

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