This AI stock struggled against broader market forces ahead of its quarterly earnings report.Shares of C3.ai (AI 0.42%) fell 12.8% in August, according to data provided by S&P Global Market Intelligence. The stock slumped ahead of its quarterly earnings report as investors adjusted their expectations for AI software.August started out tough for AI stocksAI stocks showed weakness across the board in the first week of August. The likes of Microsoft (MSFT 1.00%), Alphabet (GOOG -1.57%) (GOOGL -1.33%), Nvidia ( ...