Select the most appropriate option to fill in the blank and make a grammatically correct sentence.

The passengers _____ left Paris airport at six arrived in Rome an hour later.

who

The most appropriate option to fill in the blank and make a grammatically correct sentence is:

☀ who

The sentence would read: "The passengers who left Paris airport at six arrived in Rome an hour later."

Explanation: "Who" is the relative pronoun used to introduce a defining (restrictive) relative clause. It connects the subject "passengers" with the verb "left," providing additional information about the passengers who performed the action. The other options don't fit the context:

• Which: This is used for non-restrictive clauses and doesn't fit the context of specifying which passengers left the airport.

• Whom: This is the object form of "who" and isn't appropriate for the subject position.

• Whoever: This is used in conditional or indefinite contexts and doesn't fit the context of specifying a particular group of passengers.