**Core Concept**
The child's presentation of increased sweating following a scorpion sting suggests a systemic response to the venom, which can cause excessive sympathetic activity. This is mediated through the release of neurotransmitters such as acetylcholine and catecholamines, leading to various systemic effects.

**Why the Correct Answer is Right**
The next best step is to administer a specific antidote that can counteract the effects of scorpion venom. Scorpion venom contains a toxin that acts on the nicotinic acetylcholine receptors, leading to excessive release of acetylcholine. The specific antidote for this scenario is pralidoxime (2-PAM), which works by reactivating acetylcholinesterase, the enzyme responsible for breaking down acetylcholine.

**Why Each Wrong Option is Incorrect**
* **Option A:** Administering atropine would be incorrect because it is a muscarinic antagonist, and the primary effect of scorpion venom is on nicotinic receptors.
* **Option B:** Activating cardiac arrest protocols would be premature as there is no indication of cardiac arrest or severe bradycardia in this scenario.
* **Option C:** Administering benzodiazepines may help with anxiety but would not address the underlying cause of the increased sweating and sympathetic activity.

**Clinical Pearl / High-Yield Fact**
Scorpion stings can cause a range of systemic effects, including increased sweating, hypertension, tachycardia, and respiratory distress. Prompt administration of pralidoxime (2-PAM) can help reverse these effects.

**Correct Answer: A. Pralidoxime (2-PAM)**