Explanation:

The highest civilian award instituted by the Government of India specifically for promoting unity and integrity is the **Sardar Patel National Unity Award**. This award was instituted in 2019 and is given for outstanding contributions to promote unity and integrity of India. Option (A) Padma Shri and Option (D) Padma Vibhushan are general civilian awards, ranking below Bharat Ratna, for distinguished service in various fields, but are not specifically focused on unity and integrity. Option (B) APJ National Unity Award is not a highest civilian award instituted by the Government of India for this specific purpose; while there may be awards named after Dr. A.P.J. Abdul Kalam, they are not the official highest civilian award for unity and integrity. Therefore, the Sardar Patel National Unity Award is the correct answer.