Which of the following muscles act involuntarily?
$(a)$ Striated muscles $(b)$ Smooth muscles
$(c)$ Cardiac muscles $(d)$ Skeletal muscles

  • A
    $(a) \text{ and } (b)$
  • B
    $(b) \text{ and } (c)$
  • C
    $(c) \text{ and } (d)$
  • D
    $(a) \text{ and } (d)$

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