Task: Question Answering
Input (English): Question: If the sum of n terms of two series in A.P. are in the ratio (5n + 4) : (9n + 6) then find the ratio of their 13th terms.

 Option A: 129/139

 Option B: 129/1378

 Option C: 129/136

 Option D: 129/134

 Option E: 129/131
Output (English): Option E