<prompt> Translate the following text to EnglishZaidi ya hayo, wakati chaguzi zilipowekwa ili mvulana asingeweza kutoa kundi lake zaidi bila kutoa faida kwa makundi yote mawili, wavulana bado walichagua kuongeza tofauti ya tuzo kati ya makundi.  <response>: Furthermore, when the options were fixed so that a boy could not give his group more without sacrificing profits for both groups, the boys still chose to maximize the difference in rewards between groups. 