Name Recall: This is a direct fact-recall question — the 'Law of the Minimum' is named after and always attributed to one scientist.
Justus von Liebig proposed it: plant growth is limited by whichever nutrient is scarcest, no matter how abundant the others are.
Mitscherlich, Blackman, and Lawes are all real agricultural scientists associated with OTHER laws/principles (e.g. Mitscherlich's law of diminishing returns), so they don't apply here.