Although the report was comprehensive in its scope, but it was also somewhat dense and difficult to read for the average layperson.

The correct answer to the question "Although the report was comprehensive in its scope, but it was also somewhat dense and difficult to read for the average layperson." is Option A: Although the report was comprehensive in its scope, it was also somewhat dense.

The other options — B) The report was comprehensive in its scope, but it was also somewhat dense, C) Despite being comprehensive in its scope, but it was also somewhat dense, D) Comprehensive in its scope, however, it was also somewhat dense — are incorrect for this GMAT Exam Prep question. As explained above: The conjunction 'Although' already establishes a contrast. Using 'but' immediately after a clause beginning with 'Although' creates redundancy and a grammatical error. Removing 'but' corrects the sen…