"I couldn't catch the part that gave the answer for this question."
- "I couldn't catch the part that gave the answer for this question."
"I couldn't catch ~" 「〜が聞き取れなかった」
"the part that ~" 「〜部分」
"gave the answer for ~" 「〜の答えにあたる」
"this question" 「この質問」代わりに質問の番号も言えます。"for question 2" 「質問2」