Algal Cultures in Sealed Containers Were Exposed to Radiolabeled [¹⁴C]O₂

Algal cultures in sealed containers were exposed to radiolabeled [¹⁴C]O₂ for a brief incubation period.Soluble molecules were extracted from the algae and subjected to 2D-paper chromatography.How many carbons are found in the most predominant spot on the chromatogram?

A) 2
B) 1
C) 3
D) 4
E) 6