**Core Concept**
Coronaviruses are a family of enveloped viruses that primarily infect animals and birds, but some strains can cause zoonotic transmission to humans. They are characterized by their unique club-shaped spike proteins on their surface.

**Why the Correct Answer is Right**
The correct answer states that coronaviruses are non-enveloped, which is incorrect. Coronaviruses are actually enveloped viruses, meaning they have a lipid bilayer membrane surrounding their genetic material. This envelope is made up of a mixture of lipids and proteins, including the characteristic club-shaped spike proteins. The envelope plays a crucial role in the virus's ability to infect cells and replicate.

**Why Each Wrong Option is Incorrect**
* **Option B:** While coronaviruses can indeed spread through coughing and sneezing, this is not the only method of transmission. They can also be transmitted through contact with contaminated surfaces, close contact with infected individuals, and possibly through airborne transmission.
* **Option C:** This statement is true. Most coronaviruses infect animals and birds, but some strains, such as SARS-CoV-2, can cause zoonotic transmission to humans.
* **Option D:** This statement is also true. Human infection with coronaviruses is relatively rare, but it can occur, especially with certain strains like SARS-CoV-2.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that coronaviruses are enveloped viruses, which affects their structure, transmission, and behavior. This knowledge is crucial for understanding the epidemiology and control of coronaviruses, including the COVID-19 pandemic.

**✓ Correct Answer: A. Corona viruses are non-enveloped**