Accumulations of lymphocytes embedded in connective tissue networks are called and can be present in static locations or acutely accumulate in areas of infection.

Lymphatic tissues

Explanation: Lymphatic tissues have various distinct configurational groups correlated to its specific purpose in the resistance of a particular infection reaction. Lymphatic tissues can be primary or secondary in basic features, the primary lymphatic tissues in humans being thymus and bone marrow. However, the lymphocytes are shaped from a long thin corroborative section of cells in the soft fatty material in the compartments of bones in which cells are generated and then distributed in the lymphatic tissue.

Lymphatic  Tissues- secondary lymphatic tissues.

Explanation:

Tissues in the body where lymphocytes are found are called lymphatic tissues.These lymphocytes can be arranged in different forms in the lymphatic  tissue.When arranged  in cylindrical shape in groups they are called lymphatic patches.

The Lymphatic  tissues can be primary  when  found in the thymus and bone marrow for  maturation of antigen recognition  lymphocytes, and removal of self -recognition  antigens.

OR

Secondary  Lymphatic tissues  where  antigen are accumulated,and the mature T and B  lymphocytes  recognise them, for adaptive response. it is the secondary lympahtic tissues  that  proliferation of Tand B cells  to effectors  and memory cells;  occurs for  migration  to the sites of infections, to attack the antigens.

Invasion of the body by antigens can be at different locations in the body, thus the lymphatic tissues are well distributed in any part of the  body( spleen, thymus,tonsils ) to provide protection, in anticipation of antigenic attack.

i think the answer is b.