Fill in the blank with the most suitable option: _________ of an emergency, call 911.
For the sake
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Correct option is B)
Prepositional phrases are a group of words containing preposition which lacks either a verb or a subject. Such phrases always have two basic parts: object and preposition. Prepositions are mostly followed by objects.
Using option B will justify all the above rules. 'In case of an emergency' is a prepositional phrase as 'in case' is the preposition and 'emergency' is the object.