Answer:
Smoking is bad for your health is B. too broad.
Step-by-step explanation:
As a thesis statement, smoking is bad for your health can easily be considered too broad. A thesis statement must express the main idea of the research paper or essay. To do it efficiently, it must be very specific, must be supported by equally specific evidence and must summarize the points developed throughout the text.
Therefore, smoking is bad for your health is too broad to be considered an effective thesis statement.