The pairs of places of pilgrimage and their locations are:

(i) Srisailam: Nallamala Hills - This pair is correctly matched. Srisailam is a holy town situated in the Nallamala Hills of Andhra Pradesh, India. It is home to the famous Srisailam Mallikarjuna Temple, one of the twelve Jyotirlinga temples dedicated to Lord Shiva.

(ii) Omkareshwar: Satmala Hills - This pair is incorrect. Omkareshwar is a sacred town located in the Khandwa district of Madhya Pradesh, India. It is situated on the banks of the Narmada River, and the Omkareshwar Jyotirlinga Temple dedicated to Lord Shiva is located here.

(iii) Pushkar: Mahadeo Hills - This pair is also incorrect. Pushkar is a holy town situated in the Ajmer district of Rajasthan, India. It is located in the Aravalli Range of hills, and the town is famous for the Pushkar Lake and the Brahma Temple.

Therefore, the correctly matched pair is (i) Srisailam: Nallamala Hills, and the answer is A: Only (i).