The correct answer is option 4: Their trading company was heavily dependent on the French Government.

In the 18th century, the French attempted to establish control and expand their influence in India. However, they faced several challenges that prevented their success. One of the main reasons for their failure was their heavy reliance on the French Government for support.

The French East India Company, which was responsible for their operations in India, faced financial constraints due to the constant need for funding from the French Government. This limited their resources and hindered their ability to compete with other European powers, such as the British, who had more independent and self-sustaining trading companies.

Additionally, the French Government`s involvement often led to conflicting interests and political complications. The French Government would frequently interfere in the company`s affairs and decision-making process, causing instability and confusion. This lack of autonomy and dependence on the government ultimately weakened the French position in India.

Therefore, option 4 correctly identifies that the French trading company`s heavy dependence on the French Government was a significant reason why the French could not succeed in India in the 18th century.