Question

ああいいい

203番についてです。
答えは4なのですが、なぜそれ以外の選択肢がダメなのか教えて頂きたいです😭

203
It's (
①expensive
) much more than I paid for it.
2 high
3 valuable
4 worth
(千葉商大 )
ong should try and be (
) of others.