The Dutt-Bradley thesis, as mentioned in option 4, is a document produced by the Communist Party. It proposes that the National Congress could play a significant role in realizing the anti-imperialist people`s front. The thesis suggests that the Congress has the potential to take a leading position in the struggle against imperialism, in cooperation with other anti-imperialist forces.

Option 1, stating that the Working Committee of the Indian National Congress decided that Congress should play a crucial role in realizing the independence of India, is not an accurate explanation of the Dutt-Bradley thesis.

Option 2, stating that the Socialist party decided to play the foremost part in the anti-imperialist struggle, is not directly related to the Dutt-Bradley thesis.

Option 3, mentioning the ten-point plan put forth by revolutionary socialist Batukeshwar Dutt, is not connected to the Dutt-Bradley thesis.

It is important to note that the provided answer is generally correct. No alert for an incorrect answer is necessary.