Correct Answer - Option 3 : E
Given words are:
DAM PLY DIG RUN EAR
Letter arrangement in English alphabetical series within words as:
ADM, LPY, DGI, NRU, AER
Reverse dictionary order of these words as:
NRU, LPY, DGI, AER, ADM
Fourth word from left end is AER.
The middle letter of AER is E.
Hence, E is the correct answer.