What this statement means is that even if people are speaking bad on your name do not live up to the bad things they said about you. Or in other words prove them wrong.
The most credible source in terms of researching the effects of smoking is letter b, research article in a scientific journal. It is because a credible source means that it is valid or could be relied on in which the research article is, because it has been researched and holds validity of which contains proof. Other choices does not correspond to the question for they don't hold any validity or proof in the topic that could be reliable.
Rule 1. A subject will come before a phrase beginning with of. This is a key rule for understanding subjects. The word of is the culprit in many, perhaps most, subject-verb mistakes.
A bouquet of yellow roses lends color and fragrance to the room.
Rule 2. Two singular subjects connected by or, either/or, or neither/nor require a singular verb.
My aunt or my uncle is arriving by train today.
The story is set largely in catacombs underneath Montresor's home in Italy. The setting contributes significantly to the horror of the story. It is dark, cold, and damp in the catacombs. Because catacombs are burial vaults, Montresor and Fortunato pass by piles of bones, the remains of dead bodies.
The setting impacts the plot by the use of morbid imagery and tone as well as the demeanor of the characters. The mood of the story is one of impending doom and suspense. The setting impacts the mood with the dark imagery and morbid symbolism used throughout.