Explanation:

- Narender's Efficiency: Narender completes 4/5 of the work in 20 days. So, total work takes him 25 days (5/4 * 20).

- Narender's Work per Day: 1/25 of work.

- Ajay's Efficiency: 25% more efficient than Narender, so he can do 1.25 * (1/25) = 1/20 of work per day.

- Combined Work in 5 Days: In five days, Narender and Ajay do (1/25 + 1/20) * 5 = 9/20 of the work.

- Remaining Work: 11/20 of work is left after their contribution.

- Neha's Work: Neha completes this remaining 11/20 in 11 days, so she did 1/20 of work per day.

- Comparison of Neha and Narender's Efficiency: Both did 1/20 work per day, so Neha is 0% more efficient than Narender.

The efficiency of Neha is none more or less than that of Narender.

So, the correct option is ?? Option 5: None of these