これらの花は何でしょう？ What are those flowers?

答え
一番向こうの三列目の黄色い花 yellow flower at the 3rd (back) line : 菜の花 rape blossoms

ニ列目の白い花 white flower at the 2nd line : 大根の花 flowers of radish

手前一列目の黄色い花 yellow flower at the 1st (front) line : 白菜の花 flowers of napa cabbage