To solve this problem, we need to analyze the given statements:$\newline \bullet$Statement I: Autoimmune disorder is a condition where the body’s defense mechanism recognizes its own cells as foreign bodies.$\newline$ - This statement is correct. In autoimmune disorders, the immune system mistakenly attacks the body's own cells, thinking they are foreign.$\newline \bullet$Statement II: Rheumatoid arthritis is a condition where the body does not attack self cells.$\newline$ - This statement is incorrect. Rheumatoid arthritis is an autoimmune disorder where the immune system attacks the joints, mistaking them for foreign tissue.$\newline$Based on the analysis:$\newline \bullet$Statement I is correct.$\newline \bullet$Statement II is incorrect.$\newline$Therefore, the most appropriate answer is Option 3: Statement I is correct but Statement II is incorrect.