Introduction:
The Varanasi-Kanyakumari National Highway is one of the longest national highways in India, spanning a distance of approximately 3,839 kilometers. It passes through multiple cities and towns, connecting the northern part of India to the southern tip. In this question, we need to identify which one of the given options is not situated on this highway.

Explanation:
To determine the correct answer, let's analyze each option:

Option A: Satna
Satna is a city in the Satna district of Madhya Pradesh, India. It is located on the National Highway 39, which connects it to various other cities. However, Satna is not situated on the Varanasi-Kanyakumari National Highway. Therefore, option A is the correct answer.

Option B: Rewa
Rewa is also a city in the state of Madhya Pradesh, India. It is situated on National Highway 39, which connects it to Satna and other cities. Since Rewa is located on the same highway as Satna, it is not the correct answer.

Option C: Katni
Katni is a city in the Jabalpur district of Madhya Pradesh, India. It is situated on National Highway 30, which connects it to various other cities. Similar to Rewa, Katni is also not located on the Varanasi-Kanyakumari National Highway. Therefore, it is not the correct answer.

Option D: Jabalpur
Jabalpur is a city in Madhya Pradesh, India. It is situated on National Highway 44, which is a part of the Varanasi-Kanyakumari National Highway. Therefore, Jabalpur is situated on the Varanasi-Kanyakumari National Highway and is not the correct answer.

Conclusion:
Among the given options, option A (Satna) is not situated on the Varanasi-Kanyakumari National Highway. Therefore, option A is the correct answer.