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Unzip multiple files

I am new unix user and those question may appear relatively easy but could you please help me. I have directory where there are multiple folders, each of folder contains .gz file. How can i unzip all of them at once?

My data looks like this List of folders

A
B
C
D

In every of them there is file as

A
a.out.gz
B
b.out.gz
C
c.out.gz
D
d.out.gz