Millie might not be able to attend the play tonight because

she still has to find someone to watch her two year old
daughter for the night.
Which version of the sentence corrects the error in the compound
adjective?
(1 point)
Millie might-not be able to attend the play tonight
because she still has to find someone to watch her
two year old daughter for the night.
Millie might not be able to attend the play tonight
because she still has to find someone to watch her
two-year-old daughter for the night.
Millie might not be able to attend the play to-night
because she still has to find someone to watch her
two year old daughter for the night.
Millie might not be able to attend the play tonight
because she still has to find someone to watch her
two year old-daughter for the night.

The correct version of the sentence is:

Millie might not be able to attend the play tonight
because she still has to find someone to watch her
two-year-old daughter for the night.