Die by (আকস্মিক বা ইচ্ছাকৃতভাবে মরা) যেমন- He died by accident. Die of (রোগে মরা) যেমন- He died of cancer. Die for (মহৎ কারণে মরা) যেমন- He died for our country. Die from (কোনো কারণে মরা) যেমন- He died from over eating, তাই সঠিক উত্তর (ঘ)।