Phenol can be prepared by

Dow's Process is a method for producing phenol.

Dow's method has demonstrated to be effective in producing phenol.

Phenol may be produced using the Dow method. The reactant chlorobenzene is heated with aqueous sodium hydroxide at 623K and 300atm to create sodium phenoxide ion. The next step includes treating sodium phenoxide ion with diluted HCl to get phenol as the final product.

Hence option A is correct