Aerial metagenomics refers to the scientific technique of collecting and analyzing DNA samples directly from the air to identify the biological community present in a habitat.

• Metagenomics: This is the study of genetic material (genomes) recovered directly from environmental samples (like soil, water, or air). It bypasses the need for isolating and culturing individual species in a lab.
• Environmental DNA (e-DNA): Organisms shed DNA into their surroundings through various means such as breath, skin, fur, or waste. This genetic material found in the environment is known as e-DNA.
• Aerial Sampling: In 'Aerial' metagenomics, researchers use specialized filters or vacuum systems to capture this e-DNA from the air. This allows for the simultaneous monitoring of multiple species (animals, plants, fungi, and microbes) in a specific area at one go, providing a non-invasive way to track biodiversity.

Hence, option A is correct.