Plz help

When should readers refer to a dictionary instead of relying on context clues? select all that apply.when they have timeeach unfamiliar word they findwhen the surrounding words are unfamiliarwhen an unfamiliar word appears frequently

Can someone explain this to me clearly plz

Hhhhhhhhhheeeeeeeeeeeeeeeeeeeeelllllllllllllllpppppppppppp me