help me with an easy english writing skills please thax so much?

When new information interferences with that already stored in our memory, they can push aside or get mixed up with the old information
which of the following is the best way to write the underlined portion of this sentence? if u think its correct choice option 1.

a.our memory, they can
b.your memory, they can
c.our memory, it can
d.your memory it can
e.our memory it can
 
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