The least count of a stopwatch is $0.2 \mathrm{s}$. The time of $20$ oscillations of a pendulum is measured to be $25 \mathrm{s}$. The percentage error in the measurement of the time period will be

• A

  $8\%$
• B

  $1.8\%$
• Correct answer
  C

  $0.8\%$
• D

  $0.1\%$

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