If \(\mu_{\mathrm{s}}, \mu_{\mathrm{k}}\) and \(\mu_{\mathrm{r}}\) are coefficients of static friction, sliding friction and rolling friction, then

• A

  \(\mu_{\mathrm{s}} < \mu_{\mathrm{k}} < \mu_{\mathrm{f}}\)
• B

  \(\mu_{\mathrm{k}} < \mu_{\mathrm{r}} < \mu_{\mathrm{s}}\)
• Correct answer
  C

  \(\mu_{\mathrm{r}} < \mu_{\mathrm{k}} < \mu_{\mathrm{s}}\)
• D

  \(\mu_{\mathrm{r}}=\mu_{\mathrm{k}}=\mu_{\mathrm{s}}\)

Hence, the correct answer is option: 'C'.