Question of the day--Only the geniuses can get this (see question here)

#Question of the day....

How smart are you?.... A lady walks into a store and steals #1000 from the register without the owner's knowledge. She comes back 5mins later and buys #700 worth of goods with the #1000.  The owner gives her #300 as change, how much did the owner lose?
A) #300
B) #700
C) #1,000
D) #1,300
E) #1,700
F) #2,000

Do not overthink... comment ur answer below