Observe the following reactions and its mechanistic steps and intermediate products.
If `Ph-CH=O^(18)` is used then `O^18` is traced in reaction-2:
A. `Ph-undersetunderset(O)(||)C-O^(18)-H`
B. `CH_3-undersetunderset(O)(||)C-C^(18)-H`
C. `Ph-CH=CH-undersetunderset(O)(||)C-O^(18)-H`
D. `H-O-undersetunderset(O)(||)C-O^(18)-H`