Answer:
Archaea.
Explanation:
The taxonomy is the branch of biology that mainly studies the classification of the organisms. Organisms are classified on the basis of similarities and differences among them.
Linnaeus is known as the father of taxonomy. The five kingdom classification was classified by Whittaker. Later on the domains classification was introduced and accepted much more better than the kingdom classification. Three domains of life are bacteria, eukarya and archaea.
Thus, the correct answer is option (A).
