What Finding of the Arterial Blood Gas Suggests a More $\mathrm { PCO } _ { 2 } \quad 32 \mathrm {~mm} \mathrm { Hg }$

What finding of the arterial blood gas suggests a more severe attack of asthma and impending respiratory failure?

A) $\mathrm { PCO } _ { 2 } \quad 32 \mathrm {~mm} \mathrm { Hg }$
B) $\mathrm { PaCO } _ { 2 } \quad 42 \mathrm {~mm} \mathrm { Hg }$
C) $\mathrm { pH } \quad 7.5$
D) $\mathrm { PO } _ { 2 } \quad 59 \mathrm {~mm} \mathrm { Hg }$