Antibodies work by attaching to making them useless.
a.

allergens

c.

viruses
b.

antigens

d.

protists

Antibodies work by attaching to antigens.

Explanation:

Antibodies or immunoglobulins are substances produced by the immune system that help to fight against foreign substances or antigens that enter the body.

When an antigen enter the body, the immune system is stimulated to produce antibodies. These antibodies attache to antigens thereby destroying or killing and removing them from the body.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.