The correct answer is: B. Fungi
Fungi are a diverse group of eukaryotic organisms that are found in almost every environment on Earth. They are important decomposers, and they also play a role in the nitrogen cycle. Fungi are also used in the production of food, medicine, and biofuel.
In recent years, fungi have also been studied for their potential to help us understand and explore outer space. For example, fungi have been shown to be able to survive in extreme environments, such as those found on Mars. This suggests that fungi could be used to help us colonize other planets in the future.
Bacteria are also a diverse group of organisms, but they are not eukaryotes. Bacteria are prokaryotes, which means that they do not have a nucleus or other organelles. Bacteria are found in almost every environment on Earth, and they play a vital role in the cycling of nutrients. However, bacteria are not as well-suited to life in outer space as fungi are.
Yeasts are a type of fungus. They are single-celled organisms that are found in many different environments, including on Earth and in outer space. Yeasts are used in the production of bread, beer, and wine. They are also used in the production of biofuels.
In conclusion, the correct answer to the question “They have also proved extremely useful in our quest of knowledge of outer space” is B. Fungi.