Final answer:
Volatile organic compounds (VOCs) frequently consist of 1) C and H only (carbon and hydrogen), categorizing them as hydrocarbons, which can be further subdivided into aliphatic and aromatic hydrocarbons.
Step-by-step explanation:
Many volatile organic compounds (VOCs) have molecules composed of C and H only. These compounds are known as hydrocarbons, which are the simplest organic compounds consisting solely of carbon (C) and hydrogen (H). Hydrocarbons can be divided into two main types: aliphatic and aromatic hydrocarbons. VOCs are commonly found in various everyday items such as household products, fuels, and building materials, and they can be released into the environment during use or even when stored.
Due to their volatility, VOCs can easily evaporate into the atmosphere, leading to indoor and outdoor air pollution. This characteristic of VOCs contributes to several environmental and health issues, such as the formation of ozone and sick building syndrome.
Hence, the correct answer is Option 1.