The correct option is B less than 1
Respiratory quotient (RQ) is the ratio of volume of carbon dioxide evolved to volume of oxygen consumed during respiration.
RQ of proteins is about 0.9. For example: Consider albumin -
C72H112N18O22Albumin+77O2⟶63CO2+38H2O+ATP
RQ=63CO277O2=0.818 (around 0.9)
When we divide the number of CO2 molecules evolved by the number of O2 molecules consumed, we get near about 0.9. Hence, RQ for proteins is less than 1.