Which sentence is spelled correctly?
a. they’re going to a restaurant to pick up they’re order.
b. their going to the restaurant go to pick up there order.
c. they’re going to the restaurant to pick up there order.
d. they’re going to the restaurant to pick up their order.

Answer is D.

Explanation:

They're is a contraction of They are, Their is possessive of the item, person or place. (Ex: Their house, their boyfriend, their car)

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