The correct answer is Gurugram.
Gurugram is a major automobile manufacturing hub in Haryana. It is home to several major automobile companies, including Maruti Suzuki, Honda Cars India, and Hero MotoCorp. The city has a well-developed infrastructure and a skilled workforce, which makes it an attractive location for automobile manufacturing.
Faridabad is another major city in Haryana with a significant automobile manufacturing presence. However, Gurugram is the larger and more developed of the two cities, and it has a larger concentration of automobile manufacturing companies.
Panipat is a smaller city in Haryana with a smaller automobile manufacturing presence. The city is home to a few automobile manufacturing plants, but it is not as significant a manufacturing hub as Gurugram or Faridabad.
Karnal is the smallest of the four cities mentioned, and it does not have a significant automobile manufacturing presence. The city is home to a few small automobile manufacturing plants, but it is not a major automobile manufacturing hub.