Spectatoring refers to observing one's partner during sex

What are substances such as viruses, bacteria, and fungi that can trigger an immune response?

a) allergens b) antigens c) immuno-agents d) anti-infectious agents

For the Spearman r, the null hypothesis states that

a. there is no correlation in the sample b. there is no correlation in the population c. the correlation is significant d. the alpha level is zero