What is the average of the two middle rational numbers if \[\frac{4}{7},\frac{1}{3},\frac{2}{5}\] and \[\frac{5}{9}\] are arranged in ascending order?

• A. \[\frac{80}{90}\]                                              
• B. \[\frac{86}{45}\]
• C. \[\frac{43}{45}\]                              
• D.        \[\frac{43}{90}\]