A Person Who Travels from Sea Level to a High $P _ { o _ { 2 } }$

A person who travels from sea level to a high elevation will initially experience bouts of increased ventilation followed by periods of suppressed ventilation.After a day or two,ventilation will be increased without suppression.The best explanation for the initial events is

A) Arteriolar $P _ { o _ { 2 } }$ is decreased, which initiates reflexes leading to increased ventilation.Increased ventilation causes an increase in blood $\mathrm { P } _ { \mathrm { CO } _ { 2 } }$ , which initiates reflexes leading to decreased ventilation
B) Arteriolar $\mathrm { P } _ { \mathrm { CO } _ { 2 } }$ is decreased, which initiates reflexes leading to increased ventilation.Increased ventilation causes an increase in blood $P _ { o _ { 2 } }$ , which initiates reflexes leading to decreased ventilation
C) Arteriolar $P _ { o _ { 2 } }$ is decreased, which initiates reflexes leading to increased ventilation.Increased ventilation causes a decrease in blood $\mathrm { P } _ { \mathrm { CO } _ { 2 } }$ , which initiates reflexes leading to decreased ventilation
D) Arteriolar $\mathrm { P } _ { \mathrm { CO } _ { 2 } }$ is increased, which initiates reflexes leading to increased ventilation.Increased ventilation causes an increase in blood $P _ { o _ { 2 } }$ which initiates reflexes leading to decreased ventilation
E) Arteriolar $P _ { o _ { 2 } }$ is increased, which initiates reflexes leading to increased ventilation.Increased ventilation causes a decrease in blood $\mathrm { P } _ { \mathrm { CO } _ { 2 } }$ , which initiates reflexes leading to decreased ventilation