Which of the Following Explains the Basis for Permissive Hypercapnia

Which of the following explains the basis for permissive hypercapnia as a ventilator strategy for ARDS?

A) Introduction of CO₂ into the breathing circuit to stimulate spontaneous breaths.
B) Use of lower tidal volumes and accepting a gradual rise in PCO₂ to avoid associated hazards of high P_aw.
C) Allow patients with ARDS to breathe spontaneously to build their respiratory muscular endurance.
D) To use exhaled CO₂ to increase residual volume and improve gas exchange.