The list shown in the image is sorted alphabetically in ascending order by which of the following?

$\backslash$table$[[$Flrst Name,Last Name,Company,Address,Clty$,$State$],[$Julla$,$Nicholson,DuBa & Assoclates,$777$ Garcla Ave.,Washington,DC$],[$Joel$,$Marian,Tremont Group,$7141$ Ramona St$.,$Westboro,MA$],[$Sahar$,$Moore,Hamlet Farms,$1423$ Peachtree Dr$.,$Columbia,MO$],[$Kristin$,$Laban,Hamlet Farms,$1423$ Peachtree Dr$.,$Columbia,MO$],[$Elizabeth$,$Milko,Quick Insurance Co$.,23$ Pebble Beach Rd$.,$Lakeville,NY$],[$Michael$,$Serraino,Peterson's Drugs,$1560$ Duke St$.,$Nlagara Falls,NY$],[$Jordan$,$Shrler,M$.$C$.$&B$.,47$ Jean Dr$.,$Peekskill,NY$],[$Mike$,$Joyce,EGS,$234$ Sooner Way,Penfield,NY$],[$James$,$Kling,$cos,595$ Blossom Rd$.,$Rochester,NY$],[$Darcy$,$Neyman,Metros University,$159$ Rutgers St$.,$Dayton,$OH$