Consider the Data Below to Answer the Following Question(s)

Consider the data below to answer the following question(s) .
When CO₂ is bubbled through an ether solution of benzylmagnesium bromide and the resulting mixture is acidified, phenylacetic acid is produced. Any unreacted benzylmagnesium bromide is converted to toluene in the acidification step.
-Refer to instructions. This reaction can be described as a _____ process.

A) carbonylation
B) carboxylation
C) carbaniolation
D) cationation