The correct answer is B. Objective and formal
Step-by-step explanation:
A functional text is a text that provides information to complete a task, activity or achieve a purpose that is usually related to basic and necessary daily activities, this includes menus, recipes or manuals. Due to the purpose of these texts, functional texts are mainly concise and have an objective and formal tone (tone refers to the attitude of the writer), because, in this texts, the author does not aim at showing a positive or negative attitude towards the subject instead the information is presented neutrally; also, the tone is formal as the language used is mainly formal which shows the author has knowledge about the topic described and he or she is serious.