Step 1: Historical background.
The Geneva Convention is a series of international treaties that set standards for humanitarian treatment in war. The first convention was held in 1864, initiated by Henry Dunant, the founder of the Red Cross.
Step 2: Analyzing the options.
(A) 1854: Incorrect — this predates the first Geneva Convention.
(B) 1864: Correct — the first Geneva Convention was signed on 22nd August 1864.
(C) 1874: Incorrect — this was later, not the first.
(D) 1884: Incorrect — also later.
Step 3: Conclusion.
Thus, the first Geneva Convention was held in 1864.