Which choice best describes the overall structure of the text?

Source Texts

Text

Horizontal gene transfer involves the exchange of genetic material between organisms not in a parent-offspring relationship. It is common among prokaryotes (single-celled organisms, such as the bacteria Carnobacterium viridans and Lactococcus lactis). The process can have the effect of increasing bacterial resistance to antibiotics; as such, an understanding of how to prevent horizontal gene transfer might result in the mitigation of dangerous pathogens (organisms that cause disease).

It provides a history of research into a biological process and suggests a direction for further investigation.

It explains why an organism poses a threat and then suggests how that threat might be avoided.

It depicts two organisms and presents their similarities and differences.

It describes a biological process and explains why researching it is important.