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'.

Question: At neutral pH, a mixture of amino acids in solution would be predominantly:
Options: <1> Dipolar Ions <2> Non-polar molecules. <3> Positive and monovalent. <4> Hydrophobic <5> Negative and monovalent.
1