Answer:
Option). eukaryotic.
Explanation:
Thermus aquaticus is a bacterium, that belongs to kingdom Monera. Bacteria are prokaryotic organisms, in which true nucleus is absent as prokaryotes lack membrane-bound organelles
Mushroom is a fungus that belongs to kingdom Fungi. Mushrooms are eukaryotic organisms, in which membrane-bound organelles, such as nucleus, endoplasmic reticulum and mitochondria are present.
Thus, the correct answer is option). eukaryotic.
