Answer:
semisolid (agar)
Step-by-step explanation:
The correct answer is B) Semisolid or Motility Agar. This is a type of specialized medium that is used to detect motility in bacteria. It contains a lower concentration of agar than other types of media, allowing for greater movement of bacteria.
When bacteria are stabbed into this medium, they are able to move away from the stab line, indicating their ability to move or "swim" in the agar. Nutrient agar, blood agar, and MacConkey agar are all types of agar and media used for other purposes, such as general growth of bacteria or identification of certain bacterial species. It is important to use the appropriate medium for the intended purpose in order to obtain accurate results in the laboratory.