Please slove question 4 with process

​Q4. The length of the seconds pendulum is decreased by 0.3 cm when it is shifted to chennai from London. If the acceleration due to gravity at London is 981 cm/sec², the acceleration due to gravity at chennai is (assume $\mathrm{\pi }$ ²=10):

  (A) 981 cm/sec²                                         (B) 978 cm/sec²

  (C) 984 cm/sec²                                         (D) 975 cm/sec^{2 ​}