Correct Option (D)
Statement (4) posits that during the period from 1st April to 1st September, the actual progress never exceeded the expected progress. However, an analysis of the project data indicates instances where the actual progress did surpass the expected progress within this timeframe. Consequently, this statement is factually incorrect concerning the project's progression, making option (D) the correct answer to the question which seeks the statement that is not correct.
Incorrect Options:
The following statements accurately reflect the project's progression as depicted, and are therefore not the answer to the question asking for the incorrect statement:
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Option (A): Statement (1) indicates that on 1st June, the actual progress of work was less than expected. The project data confirms that actual progress lagged behind expected progress on this specific date.
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Option (B): Statement (2) claims that the actual rate of progress of work was the greatest during the month of August. An analysis of the progress data shows that the highest rate of work completion occurred during August.
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Option (C): Statement (3) suggests that the work was actually completed before the expected time. The project's actual completion milestone was achieved earlier than its expected completion date, indicating an overall acceleration in the latter stages.