The full form of SGPC is

The Shiromani Gurdwara Parbandhak Committee is the full name of the organisation. 

It is an Indian body in charge of gurdwaras, or Sikh places of worship, in the states of Punjab, Haryana, and Himachal Pradesh, as well as the union territory of Chandigarh.

Hence, the correct answer is option B, i.e., Shiromani Gurdwara Parbandhak Committee.