To determine how many invitations each person needs to take to the post office, we'll first find out how many people are involved in mailing the invitations.
Susan and Benjamin are two people, and there are three members of the bridal party helping them. Therefore, the total number of people is:
\[ 2 , (\text{Susan and Benjamin}) + 3 , (\text{bridal party}) = 5 , \text{people} \]
Next, we need to divide the total number of invitations by the number of people:
\[ \text{Invitations per person} = \frac{225 , \text{invitations}}{5 , \text{people}} = 45 \]
Thus, each person has to take 45 invitations to the post office. The correct response is \(45\).
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