Mahatma Gandhi undertook a `fast unto death` as a protest against the Communal Award. However, he discontinued the fast because of the conclusion of the Poona Pact.

Option 1 suggests that the Congress leaders successfully convinced Mahatma Gandhi to accept the Award, but this is not the reason for discontinuing the fast.

Option 2 suggests that the British Government withdrew the Communal Award, but there is no mention of this in the context of why Gandhi discontinued his fast.

Option 3 correctly states that the conclusion of the Poona Pact is the reason behind Gandhi discontinuing the fast. The Poona Pact was an agreement reached between Dr. B.R. Ambedkar and Mahatma Gandhi, which sought to secure reserved seats for the depressed classes (now known as Scheduled Castes or Dalits) in legislatures. This pact addressed the concerns raised by Gandhi during his fast and led to its discontinuation.

Option 4 suggests that the weaker classes openly opposed the Award. While it is possible that there was opposition, there is no evidence to suggest that this was the reason for Gandhi discontinuing the fast.

In conclusion, option 3 is the correct answer as it accurately reflects the reason why Mahatma Gandhi discontinued his