The correct answer and the way that the setting in the mentioned excerpt expresses Dante's views about heretics in those lines are D. The chaos of the scene means Dante thinks of heretic's thoughts and behaviour as illogical.
Dante employes a generic definition of heresy in his work: the denial of the soul's immortality. When the poem was written, there were still no separation between Catholic and Protestant churches, so heresy was mosstly the result of internal disagreement between clergy and scholars about the interpretation of theological principles. This arguments created division among communities upon who was a "true" believer and who was an heretic. This partisan arguments and division are reflecter in the chaotic scene described by Dante in the 6th Circle of Hell.