Kelp is obtained from
(a) Red algae
(b) Brown algae
(c) Lichen
(d) Green algae

Hint: Algae are unicellular organisms that can regulate the process of photosynthesis. They are the organisms that live in aquatic habitats forming colonies. This alga includes seaweeds having pigment called fucoxanthin.

Complete step by step answer:
Kelp is obtained from bris algae. Kelp is a large brown alga that lives near the shore in shallow waters. The former dance grouping and the lower part of the scalp underwater provide food and shelter to thousands of species of fishes and marine animals. Kelps are a type of seaweed and are consumed by some invertebrates. Algae can bear a range of high temperatures, oxygen or carbon dioxide concentrations, acidity, and turbidity. The rise in freshwater or saltwater oceans.

Additional information:
Red algae: It is a type of eukaryotic algae that is red due to the presence of a pigment called chlorophyll A, phycocyanin, and phycoerythrin. They are found in freshwater bodies, lack flagella, and centrioles. They have biphasic or triphasic life cycle patterns and are multicellular, filamentous blade structural algae. They show the saprophytic, parasitic, or epiphytic mode of nutrition and store their food in the form of starch and polymers of galactan sulfate. Agar-Agar is extracted from red algae and is used as dairy toppings, puddings, and instant food products.

Lichen: It is an organism that shows the symbiotic relationship between algae or cyanobacteria and fungi. The fungal partner provides shelter to the algae and algae being photosynthetic provide food to themselves and the fungus. They form colonies and are found on the surfaces of tree bark, exposed rocks, and soil crust. They are used by humans as a source of food, medicines, and dye.
Green algae: It is a type of algae that is green in color due to the presence of a pigment called chlorophyll a and b, carotene, and xanthophyll. It has a central vacuole and can be motile and non-motile. It can be single-celled, colonial, filamentous, and tubular. Their cell wall contains cellulose and stores carbohydrates in the form of starch. They contain stacked thylakoids.
So, the correct answer is 'brown algae'.

Note: Red algae are considered as the oldest type of eukaryotic algae. Diatoms, which are a type of red algae do not show the general characteristics of red algae. The 40-60% of global oxygen for terrestrial and aquatic habitats is produced by red algae. Red algae is the commercial food in Japan and some regions of the North Atlantic. Lichens serve two-third of the food supply for caribou and reindeer who roams the far Northern ranges.