ๆš‘ใ„___ใ€็ช“ใ‚’้–‹ใ‘ใพใ—ใŸใ€‚ (Because it was hot, I opened the window.)

Answer and explanation

Correct answer: C. ใ‹ใ‚‰

ใ‹ใ‚‰ gives a reason before a result.
Answer: ใ‹ใ‚‰.
Why not the others: ใฎใซ: ใฎใซ means although, which does not fit. ใฆใ‚‚: ใฆใ‚‚ means even if. ใชใŒใ‚‰: ใชใŒใ‚‰ means while.

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ๆš‘ใ„ ใ€็ช“ใ‚’้–‹ใ‘ใพใ—ใŸใ€‚ (Because itโ€ฆ | JLPT Practice (N5 and N4) - Japan