Which section of the Elections Act 2017 authorises ECP to ‘extend polling hours already fixed’?

Which section of the Elections Act 2017 authorises ECP to ‘extend polling hours already fixed’?

A. Section 82
B. Section 70
C. Section 72
D. Section 78

Section 70. Hours of the poll.— The Commission shall fix the hours, which shall not be less than eight, during which the poll shall be held and the Returning Officer shall give public notice of the hours so fixed and hold the poll according to the hours fixed by the Commission: Provided that the Commission may extend polling hours already fixed at one or more polling stations in exceptional circumstances to be recorded in writing but such decision shall be taken at least three hours before the close of the poll enabling the Returning Officer to convey the decision of the Commission to all Presiding Officers under his jurisdiction well before the time already fixed for close of the poll.