Which line is an irregular line of blank verse? “he only says, ‘good fences make good neighbours.’” “if i could put a notion in his head: ” “and on a day we meet to walk the line” “and set the wall between us once again.”

The line which is an irregular line of blank verse is the first one - “He only says, ‘Good fences make good neighbours.’”
A blank verse is a type of a line that consists of 10 syllables, where each second syllable is stressed ( = iambic pentameter that Shakespeare always used). The second, third, and fourth line are all good examples of blank verse, whereas the first line has 11, instead of 10 syllables. 

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Those are all examples of edible fish. so your answer is numbers 1 and 3.