1-C. (3) The recent shift toward relying on volunteer data is disappointing.(3) The recent shift toward relying on volunteer data is disappointing.
(3)最近の変化が、頼る傾向のダヨ、ボランティアのデータにダヨ、残念です。
disappointed[形容詞]落胆した
2-C. I was a bit disappointed that we didn't have time to go to the bookstore.I was a bit disappointed that we didn't have time to go to the bookstore.
私は少しがっかりした、というのは、私達は時間がなかったのでダヨ、行くダヨ、本屋にダヨ。
3-C. You are disappointed when you are assigned a serious role.You are disappointed when you are assigned a serious role.