Respuesta :
Answer:
The correct option is B. Which is variation in the strawberry plants.
Explanation:
- Unavoidable source of experimental error is the error which is not personal and which can not be minimized.
- It is present naturally.
- Now one can change the Length of study, the cost of watering plants and fertilization during the study.
- The only factor cannot be changed is the variation in strawberry plants.