When organisms selects their mates based on traits -ex , bright coloring ,feather size , and sounds , they are being sexually selective , which is an example of : Non-random mating
Gene flow
Inbreeding
Natural selection

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clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.

c should be the answer

if you know your abc's you should be able to get your answer or just use google