Correct answer: B. 1405 CE
Explanation: The direct answer is option B: 1405 CE. Timur, also known as Tamerlane, died in 1405 CE. To avoid confusion, keep two separate facts in sequence: he invaded Delhi in 1398 CE, and he died later in 1405 CE. Thus the calculation is not an arithmetic operation; it is a chronological check: 1398 was the invasion, 1405 was the death, so the death must be linked with 1405. Option A, 1398 CE, is wrong because that is the year of his invasion of Delhi, not his death. Option B, 1405 CE, is correct. Option C, 1451 CE, is too late and does not match Timur’s lifetime. Option D, 1486 CE, is also much later and belongs to neither the accepted death date nor the Delhi invasion. A reliable exam approach is to pair the person with both event and year instead of remembering isolated numbers. Memory cue: “Delhi 1398, death 1405.”