Respuesta :
i think it might be a adjective clause because there is a relative pronoun which is THAT. that is my opinion
Answer:
participial phrase
Explanation:
. They are easy to confuse because both gerunds and present participles end in -ing. Participles act as adjectives, and gerunds act as nouns. "Reassuring one another that they would be rescued" is the present participial phrase describing how the group kept a good attitude.