The right lung has three lobes and left lung has two lobes .
Alveolar number is closely related to total lung volume with larger lung having considerably more alveoli....normally ranging from 600 to 800 million...

So, here I think correct option is option (B)....

$$Hope it's help... $$

The correct answer is C. 19 and 300 million respectively.

Explanation:
The human lungs are a pair of respiratory organs located in the chest cavity. They are responsible for the exchange of oxygen and carbon dioxide between the body and the environment. The lungs are divided into lobes, which are further divided into smaller units called alveoli.

I. Lobes in the Lungs
The lungs are divided into lobes, with the right lung having three lobes (upper, middle, and lower) and the left lung having two lobes (upper and lower). Therefore, the total number of lobes in both lungs is 3 + 2 = 5.

II. Alveoli in the Lungs
Alveoli are tiny air sacs located at the ends of the bronchioles in the lungs. They are responsible for the exchange of gases during respiration. The alveoli provide a large surface area for the diffusion of oxygen into the blood and carbon dioxide out of the blood.

It is estimated that the average number of alveoli in an adult human lung is around 300 million. These alveoli are highly specialized structures that allow for efficient gas exchange.

III. Answer
Based on the information provided, the correct answer is C. 19 and 300 million respectively. The lungs have a total of 19 lobes (3 in the right lung and 2 in the left lung) and approximately 300 million alveoli for efficient gas exchange.

In summary, the human lungs consist of 5 lobes (3 in the right lung and 2 in the left lung) and approximately 300 million alveoli. These structures play a crucial role in the respiratory system, allowing for the exchange of oxygen and carbon dioxide in the body.