The correct answer is: B. Important
Predominant means most important, powerful, or common. It is an adjective that describes something that is greater in number, amount, or strength than others.
Lovable means deserving or arousing love. It is an adjective that describes someone or something that is very attractive or appealing.
Vague means not clearly expressed or defined. It is an adjective that describes something that is not clear or precise.
Assurance means a promise or guarantee. It is a noun that describes a statement that is intended to give confidence or certainty.
In the context of the question, “Predominat” is most likely referring to something that is important or of great significance. The other options, while they may be true of something that is predominant, do not accurately capture the meaning of the word.