When Linnaeus began classifying organisms in the 1700s, he categorized them as plant, animal, or mineral. These kingdoms were later revised to exclude minerals and expanded to include animals, plants, fungi, protists, and bacteria. Which of the following best explains a reason for this change? As new organisms were discovered, new kingdoms were created to sort them based on ability to interbreed. It was discovered that the organisms in each of the five kingdoms have a different method of obtaining nutrients and are therefore fundamentally different. Technological advances led to the discovery of single-celled organisms and increased our understanding of relationships between organisms. Genetic research led to the discovery that each of these five kingdoms has a unique evolutionary ancestor.

The correct answer will be option it was discovered that the organisms in each of the five kingdoms have a different method of obtaining nutrients and are therefore fundamentally different.

Explanation:

Carolus Linnaeus classified the organisms into 3 groups-plant, animal, or mineral which were later modified and revised by the other scientists like Ernst Mayr who proposed 3 kingdom classification, Copeland who proposed 4 kingdom classification and R.H Whittaker who proposed 5 kingdom classification.

R.H Whittaker proposed 5 kingdom classification on the basis of certain features like body organization, cell structure, mode of nutrition and phylogenetic relationships.

Thus, third option is the correct answer.