I am assuming that horses' is plural.
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If it were singular, it would be horse's.
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Sinces is it written s',it is plural.
Answer:
みなさん、こんにちは塚佐公子です。みなさんにお会いできてとても嬉しいです!
Explanation:
c:
I hate when my brother, sister, mother or father come into my bedroom and then leave with the door open
Ma sœur adore les dessins animés.