波紋

会議での彼の不用意な発言が、大きな ___ を呼んだ。

The correct answer is **波紋 (はもん)**. The phrase "不用意な発言" (careless remark) suggests a negative or unexpected consequence. "波紋を呼ぶ" is a common collocation meaning 'to cause a stir,' 'to create ripples,' or 'to have repercussions,' fitting the context of a careless remark leading to significant reactions or trouble. **期待 (きたい)** means 'expectation' or 'hope,' which usually has a positive connotation and wouldn't typically follow a 'careless remark.' **成果 (せいか)** means 'result' or 'achievement,' implying a worked-for outcome, which doesn't fit the spontaneous, often undesirable effect of a careless statement. **共感 (きょうかん)** means 'empathy' or 'sympathy.' While "共感を呼ぶ" is possible, a 'careless remark' is unlikely to elicit widespread empathy.

正解は**波紋**です。「不用意な発言」は通常、良くない影響や反応を引き起こします。「波紋を呼ぶ」は、ある言動が人々の間に広範な動揺や影響を与えることを意味し、文脈に合致します。 「期待」「成果」「共感」は、この文脈での不用意な発言の直接的な結果としては適切ではありません。