ANSWER:

They argued on a Sunday.

Explanation:

The table below summarizes the event.

A cross (x) indicate the possible days if that person’s statement is true.

The only column with a single ‘x’ is on Sunday, therefore D is the only person who is correct.

Day / Person	Mon	Tue	Wed	Thur	Fri	Sat	Sun
A	x
B			x
C		x
D				x	x	x	x
E					x
F			x
G	x	x	x	x	x	x

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