Which underlined words form a dependent clause?

(Evie jumped high into the air.)

(While we sang in the choir), our brother watched from the audience.

The house (with the tall fence) stood on a busy corner.

Whoever wants to go (shopping can board the bus now.)

B). (While we sang in the choir), our brother watched from the audience.

Explanation:

A dependent (or subordinate) clause is categorized as the clause that cannot stand independently and relies on the principal (or independent) clause to accomplish its meaning. Such clauses are most commonly characterized by its beginning with either subordinating conjunction (in most cases) or a relative pronoun followed by a subject and predicate but fail to offer a complete idea or thought.

As per the question, option B displays the underlined words 'while we sang in the chair' functioning as a dependent clause in the sentence as it justifies the above claim appropriately. It begins with the subordinating conjunction 'while' and involves a subject 'we' and the predicate 'sang in the choir' but dependent on the principal clause 'our brother watched from the audience' to complete its meaning. Thus, option B is the correct answer.