The following detail from a written work that must strongly identifies it as subjective is:
A. Bias
Bias, according to Google, means an inclination or prejudice in a way that is considered to be unfair. Subjective written work implies that writing is strongly influenced by the author's perceptions and feelings. Also, a subjective perception varies from person to person.
Example:
Subjective: Rainy days are depressing.
Objective: The earth is round.
Logos refers to logic, it is often used as a persuasive technique in argumentative writing. However, this technique aims to appeal to people's logic and therefore tries to be objective. Imagery is another writing technique that aims to convey a message by describing physical characteristics of something or someone. Finally, the tone has to do with the way the writing conveys the author's or narrator's attitude.