The correct answer is option (b) The reaserchers found many daimonds and other items of great value.
A prepositional phrase is a collection of words that includes a preposition, a noun or pronoun that serves as the preposition's object, and any object modifiers. A prepositional phrase's object can be a clause, gerund, or noun.A preposition plus the word it regulates make up a prepositional phrase, which is a component of a sentence.
Example: The puppy at the park is so happy.
So with this we can conclude that option B is the right choice and the prepositional pharse is of great value.
Read more about prepositional phrases on: https://brainly.com/question/1841317
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