Analyzing the given translations:
'Tube-well irrigates the field' → 'xopec co loa al'
'drink green tea' → 'fra ubla tho'
'field is green' → 'tho co pae'
Finding the common words between sentences 1 and 3:
Both contain the word 'field'
Sentence 1 codes: xopec, co, loa, al
Sentence 3 codes: tho, co, pae
Common code: 'co'
Therefore, 'field' = 'co'
Finding the common words between sentences 2 and 3:
Both contain the word 'green'
Sentence 2 codes: fra, ubla, tho
Sentence 3 codes: tho, co, pae
Common code: 'tho'
Therefore, 'green' = 'tho'
The code for 'field' is 'co' and the code for 'green' is 'tho'.
The answer is: co, tho (Option 3)