Which answer adds a participial phrase to this sentence? before the buzzer, the runner tripped on a shoelace. before the buzzer, the runner tripped on a shoelace and fell on the ground. before the buzzer, the runner tripped on a shoelace dangling from her shoe. before the buzzer, the runner tripped on a shoelace in front of the crowd. before the buzzer, the runner tripped on a shoelace with grace.

The option that adds a participial phrase in the sentence is C) "Before the buzzer, the runner tripped on a shoelace dangling from her shoe."

The participial phrase in this sentence is "dangling from her shoe". Participial phrases start with present or past participle. Present participle is formed by infinitive verb+ing (dangling).

Participial phrases act as adjectives in sentences, modifying a noun. In this sentence, the participial phrase is modifying the noun "shoelace".