are found especially in the mucous membrane, standing guard against parasites and allergens. Lymphocytes Basophils Neutrophils Eosinophils

The correct answer is D. Eosinophils

Explanation:

Eosinophils are a type of white cells, this means these cells are part of the immune system and protect the body from viruses, parasites, and other pathogens. Besides this, eosinophils differ from other white cells because they mainly attack parasites and allergens by eliminating nocive substances, reacting to allergens and regulating inflammation. Moreover, these can be found in the blood and mucous membranes such as the intestines, stomach or esophagus. According to this, the eosinophils are the cells found in mucous membranes that react to parasites and allergens.

"d.) carbon dioxide and hydrogen sulfide"