Purchase vs Expenditure (SOS)

[Duc]

Choose the correct answer:
I put the scarf with my mother's.......intending to pay for it on my way out.
a.purchases b.material c.object d.expenditure.
The answer is A but I wonder why it is not D because "purchases" and ''expenditure" has the same meaning.
I also don't know exactly what the phrase "put the scarf with my mother purchases" means .Can you explain this to me.
Thank you.
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Don't see your shade think you are great

[Mister Micawber]

.
No. The 'purchase' is the item bought, and the 'expenditure' is the money paid for it.
.
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Native English teacher at Mister Micawber's

[Yankee]

[Jamie (K)]

[Duc]

THANK YOU FOR ALL THESE
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Don't see your shade think you are great