There are $3$ families,each having $1$ boy and $1$ girl. If one child is selected from each family,what are the elements of the event that only girls are selected?
- A$\{ggb, gbg, gbb\}$
- B$\{bgb, gbb\}$
- C$\{bbb, bgb\}$
- D$\{ggg\}$
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