Answer:
Step-by-step explanation:
The sentence "Either Roderick or James will present his or their personalized invitation to our special sale" is grammatically correct, but it is somewhat ambiguous and could be interpreted in different ways.
The use of "either...or" suggests that the speaker is referring to two people: Roderick and James. However, the use of "his or their" is unclear and can be interpreted in two different ways.
If "his" refers to Roderick and "their" refers to James, the sentence would mean that only one person will present their personalized invitation: either Roderick will present his invitation or James will present their invitation.
If "his" and "their" are both intended to be gender-neutral and can refer to either Roderick or James, then the sentence would mean that one or both of them will present their personalized invitation.
To avoid ambiguity, the sentence could be rephrased as: "Either Roderick will present his personalized invitation or James will present his personalized invitation to our special sale."