The safety-valve thesis is a concept that suggests that the Indian National Congress (INC) served as a safety valve by channeling discontent and preventing the outbreak of violent anti-colonial movements in India during the late 19th and early 20th centuries.

Option 1 states that evidence is insufficient to establish the validity of the thesis. This suggests that there is not enough evidence to prove or support the safety-valve thesis.

Option 2 states that the author has concluded that the thesis does not hold ground. This indicates that the author has examined the available materials and has found that the safety-valve thesis is not valid or accurate.

Option 3 suggests that the Congress was a nationalist organization right from the start. However, this option is not directly related to the myth of the safety-valve thesis.

Option 4 is the correct answer. It states that the violent anti-colonial movements did not come to an end with the foundation of the Congress. This means that even though the Congress was formed, there were still instances of violent resistance against colonial rule in India. The existence of these movements contradicts the idea of the Congress serving as a safety valve to prevent violence.

In summary, the correct answer is option 4 because it accurately