The question asks about the recipient of the Saraswati Samman for the year 2018. The correct answer is option 1, K Siva Reddy.

Option 2, Mahableshwar Sail, is not the correct answer.

Option 3, Padma Sachdev, is not the correct answer.

Option 4, Sitanshu Yashaschandra, is not the correct answer.

Therefore, the correct answer is option 1, K Siva Reddy.