**Core Concept**
The patient's symptoms suggest a nasal obstruction caused by a mass lesion, which is likely a nasal polyp or tumor. However, the presence of epiphora (excessive tearing) points towards an obstruction of the nasolacrimal duct or a mass affecting the lacrimal sac.

**Why the Correct Answer is Right**
The clinical presentation is suggestive of a nasolacrimal duct obstruction. This is likely due to a mass effect from a nasal polyp or tumor, which is causing bilateral nasal obstruction and epiphora. The absence of fever makes an infectious process less likely. In this scenario, the nasolacrimal duct obstruction leads to a buildup of tears in the lacrimal sac, resulting in epiphora.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might be a distractor for conditions like allergic rhinitis or vasomotor rhinitis, which can cause nasal obstruction but not typically epiphora.
**Option B:** This option might be a distractor for conditions like sinusitis, which can cause nasal obstruction and fever, but not typically epiphora.
**Option C:** This option might be a distractor for conditions like orbital cellulitis, which can cause epiphora and nasal obstruction but typically presents with fever and other signs of infection.

**Clinical Pearl / High-Yield Fact**
Nasal polyps and tumors can cause nasal obstruction and epiphora due to their mass effect on the nasolacrimal duct. A high index of suspicion for nasolacrimal duct obstruction should be maintained in patients with bilateral nasal obstruction and epiphora.

**Correct Answer:** C. Orbital cellulitis.