**Core Concept**
Pharmacological agents that mimic the effects of amphetamine, a central nervous system stimulant, are typically classified as stimulants. These substances interact with the brain's reward system, increasing the release of dopamine and norepinephrine, which leads to enhanced alertness, energy, and focus.

**Why the Correct Answer is Right**
The correct answer is a non-synthetic alkaloid compound that acts similarly to amphetamine by increasing the concentration of dopamine and norepinephrine in the synaptic cleft. This is achieved through the inhibition of the dopamine transporter (DAT) and the norepinephrine transporter (NET), thereby preventing the reuptake of these neurotransmitters. This action enhances the effects of these neurotransmitters, leading to increased alertness, energy, and focus.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a non-synthetic alkaloid compound, and its mechanism of action does not involve the inhibition of dopamine and norepinephrine reuptake.
**Option B:** This option is incorrect because it is a synthetic compound, and its effects on the central nervous system are different from those of amphetamine.
**Option C:** This option is incorrect because it is not a non-synthetic alkaloid compound, and its mechanism of action does not involve the inhibition of dopamine and norepinephrine reuptake.

**Clinical Pearl / High-Yield Fact**
The inhibition of dopamine and norepinephrine reuptake is a key mechanism by which stimulants, such as amphetamine, exert their effects on the central nervous system. This mechanism is also exploited by certain medications, such as methylphenidate, which are used to treat attention deficit hyperactivity disorder (ADHD).

**Correct Answer:** C. Ephedrine