✨ Best Answer ✨
people だけで大丈夫です
those [ people ]とあるのはthose の代わりにpeople にしてもよいという意味です🌟
5の答えは
The number of those who visit graves during the Bon holidays is decreasing.
The number of people who visit graves during the Bon holidays is decreasing.
The number of those who visit graves during the Bon holidays has been decreasing.
The number of people who visit graves during the Bon holidays has been decreasing.
の4通りあるということです🌟
those who ~「~の人々」
people who ~にしても同じです