Question

complete the sentence with the best relative pronoun.
two oil industry workers, □ amateur video of a tornado twisting through a north dakota trailer park went viral online, were quite lucky to escape the tornado unharmed.

Explanation:

To solve this, we analyze the sentence structure. The clause "amateur video of a tornado twisting through a North Dakota trailer park went viral online" is a non - restrictive relative clause modifying "Two oil industry workers". In non - restrictive relative clauses, when the antecedent is a person and we need a possessive relative pronoun (to show that the video belongs to the workers), we use "whose".

Answer:

whose