**Core Concept**
Norepinephrine is a catecholamine neurotransmitter involved in various physiological responses, including the "fight or flight" response. Its action at the synaptic cleft is terminated through a complex process involving multiple mechanisms.

**Why the Correct Answer is Right**
Norepinephrine is primarily terminated by uptake into the presynaptic neuron through the norepinephrine transporter (NET), a sodium-dependent transporter. This process is known as reuptake. The NET is highly specific for norepinephrine and plays a crucial role in regulating the concentration of norepinephrine in the synaptic cleft. Additionally, norepinephrine can also be metabolized by monoamine oxidase (MAO) and catechol-O-methyltransferase (COMT), but reuptake is the primary mechanism of termination.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while MAO does play a role in norepinephrine metabolism, it is not the primary mechanism of termination at the synaptic cleft.
**Option B:** This option is incorrect because COMT does contribute to norepinephrine metabolism, but its role is more significant in the systemic circulation rather than at the synaptic cleft.
**Option C:** This option is incorrect because while there may be some diffusion of norepinephrine out of the synaptic cleft, it is not a significant mechanism of termination.

**Clinical Pearl / High-Yield Fact**
The norepinephrine transporter (NET) is a critical target for various antidepressants, including selective serotonin reuptake inhibitors (SSRIs) and tricyclic antidepressants (TCAs), which work by inhibiting the reuptake of norepinephrine and other neurotransmitters.

**Correct Answer:** C.