The correct option is D Sincere reporting
The option with the opposite meaning is the correct one.
The
underlined word 'yellow journalism' is an American term used for a type of journalism that does not use well-researched information in their articles. It instead uses eye-catching headlines in order to sell their newspapers.
The words 'misrepresentation', 'vulgarization' and 'sensational reporting' all relate to this type of journalism, as these aspects are seen at one point or another.
Hence they are not opposite in meaning and options A, B and C are incorrect.
Option D: 'Sincere reporting' is quite the opposite of the underlined term. The latter is explained as presenting little or no well-researched reporting whereas the former refers to reporting news or information in a sincere, honest way. Hence D is the correct option.