What values of arterial blood pH, carbon dioxide pressure (Pco2), and oxygen pressure (Po2) approximately indicate the normal fetal condition when using the umbilical cord acid-base stimulation method?
A. pH of 7.1, Pco2 of 50 mm Hg, Po2 of 20 mm Hg
B. pH of 7.4, Pco2 of 45 mm Hg, Po2 of 25 mm Hg
C. pH of 7.3, Pco2 of 45 mm Hg, Po2 of 25 mm Hg
D. pH of 7.2, Pco2 of 55 mm Hg, Po2 of 15 mm Hg