Find the part of the sentence that contains an error: The initiatives praised by the committee (1)/ are not only designed to modernise reporting systems (2)/ but also improving transparency in funding distribution (3)/ across all districts. (4)

The correct option is (c). The structure not only ... but also ... requires parallelism, meaning the grammatical form after both parts should be similar. In part (2), the phrase is designed to modernise (past participle + infinitive). However, in part (3), it becomes but also improving (gerund form), which breaks the parallel structure. To make the sentence correct, we should keep the same pattern, such as: ... are not only designed to modernise reporting systems but also designed to improve transparency ... or ... are designed not only to modernise reporting systems but also to improve transparency ... Grammatical rule used: In correlative conjunctions like not only...but also, the elements joined must be grammatically parallel (same form: infinitive with infinitive, noun with noun, clause with clause). Example (parallelism): She likes to sing and to dance. (Correct) She likes singing and to dance. (Incorrect parallelism)