Your right phrase is more identical than the others
John Conway was not the large troublemaker to whom Stuart had stand up to.
K-means clustering technique is a simple quick algorithm that can be applied to large datasets to separate them into different partitions; analysis of these partitions may provide a better characterization of neck pathologies and may be of additional benefit in distinguishing benign and malignant
The narrator used the word "I" meaning it's in 1st person & that the current story is being told by someone that it directly affects. For example, "I am typing an answer right now,".