In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Q: Question: In the analysis of arsenic by graphite chamber losses of said element can be produced by volatilization during the carbonization stage. This fact can be minimized if:
Options: <1> We raise the temperature during the carbonization stage. <2> We increase the carbonization time. <3> We add matrix modifiers that thermally stabilize the analyte. <4> We lower the temperature during the carbonization stage. <5> We modified the drying program to completely vaporize the solvent.
A:
3