The original question-specific evidence states: Many Harappan bricks followed the ratio 1:2:4. 1:2:4 is the correct answer to “What exactly was the common proportion of Harappan bricks”. This evidence connects the required Ancient History fact with its archaeological, geographical, cultural or chronological setting. Harappan evidence must be interpreted from excavated settlements, artefacts, environmental data and comparisons among sites; a single object should not automatically support a wider claim than the evidence permits. Replaying that method confirms 1:2:4 as the keyed response for this Ancient History question.