If scientist want to determine similarities in the DNA in a fragments several plant species, they should

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add salt water to cells from each plant  

compare seed structures of the plants

analyze electrophoresis results  

examine their chromosomes with a microscope

analyze electrophoresis results  

Explanation:

Electrophoresis is a laboratory technique widely used in molecular and cell biology. it has as main objective, to allow the analysis of proteins and nucleic acids, making it totally possible that it is used to determine similarities in DNA in a fragment of several species of plants. For this reason, we can say that the correct answer to your question is "analyze electrophoresis results"

Electrophoresis promotes the charging of analyzed particles through the influence of electrostatic forces established by electrodes of opposite electrical charges. It is precisely this carrying of molecules that allows relationships of similarity and differences between them to be analyzed.