Alcoholic drinks are beverages that contain alcohol, which is a type of organic compound. There are several types of alcohol, but the one commonly found in alcoholic drinks is ethanol (CH3CH2OH). Therefore, the correct answer is option 'C' - CH3CH2OH.

Below is a detailed explanation of each option and why option 'C' is the correct answer:

a) CH3OH (Methanol):
- Methanol is a toxic alcohol that is not suitable for consumption.
- It is used in industrial applications, such as solvent production and fuel.
- Consuming methanol can lead to severe health issues and can even be deadly.

b) CH3COOH (Acetic Acid):
- Acetic acid is a weak acid that is commonly found in vinegar.
- While it is used in food preparation, it is not the primary component of alcoholic drinks.
- Acetic acid does not have the intoxicating effects associated with alcoholic beverages.

c) CH3CH2OH (Ethanol):
- Ethanol is the primary alcohol found in alcoholic drinks.
- It is produced through the fermentation of sugars by yeast.
- Ethanol is responsible for the intoxicating effects of alcoholic beverages.

d) CH3COOH3 (Trifluoroacetic Acid):
- Trifluoroacetic acid is a strong acid that is not suitable for consumption.
- It is used in various chemical reactions and laboratory applications.
- Consuming trifluoroacetic acid can be extremely dangerous and harmful to health.

In conclusion, the correct option is 'C' because ethanol (CH3CH2OH) is the primary alcohol found in alcoholic drinks. It is important to note that excessive alcohol consumption can have negative effects on health and should be done responsibly.