The word “merciless” typically means showing no mercy or pity. Therefore, the word that is opposite in meaning to “merciless” would be Option C) kind.

 “Kind” means having or showing a friendly, generous, and considerate nature, which is the opposite of being merciless.

The other options do not fit in this context.

Option A: “Obscure” means not discovered or known about; uncertain.

Option B: “Faithful” means loyal, constant, and steadfast.

Option D: “Pathetic” means arousing pity, especially through vulnerability or sadness.

Therefore, “kind” is the most appropriate choice here as it is the opposite of “merciless”.