Answer: The choice that correctly completes the sentence is "his".
Explanation: "His" is a pronoun used to make reference to something that belongs to a male figure that has already been mentioned. In the sentence provided, "his" is referring to both "Omar" and "Kurt", who are male individuals. Although "their" could also be used in a sentence with a "neither...nor" structure,<u> in this sentence there is a singular verb ("has turned") and a singular noun ("permission form"); therefore, the only pronoun that fills in the gap is "his". </u>
