Fixed wrong indexed dataset

src/deepeval/reading_comp_mc.py

@@ -41,6 +41,8 @@ class ReadingComprehensionMCTask(BaseTask):
                 answer_index = answer
             else:
                 answer_index = int(answer)
+            
+            answer_index = answer_index - 1 # Because the answer is 1-indexed
             correct_answer_letter = chr(65 + answer_index)