The statement is an unjustified implication because it implies that no other vitamins are important and that no preventive measures are effective if they lack vitamin C.
Explanation:
An unjustified implication is a statement that leaves messages implicit and implied. This type of statement ends up passing messages in indirect and subjunctive ways, related to the main message being spoken.
In the statement shown in the question above, the speaker places supreme importance on vitamin C, implying that other types of vitamins and preventive measures are inefficient.
