Sentence Correction (SC) | Reporting that one of its many problems had been the recent extended s

Here are my two cents on the problem

Though initially I went for B but after analyzing briefly,I got to know my mistakes.

Theclue to the right answer choice is the wordrecent . We know that a participle phrase can either work as a noun or as an adjective.Now In answer choice A if we consider the wordextended sales slump then we find out thatextended works as anadjective that modifies the noun sales slump.But when you take them togetherthen extended sales slump actually works as a noun.So