Use the Following to Answer Questions

Use the following to answer questions :
Refer to the experiment below,which points to blood as an important factor in adaptive immunity.
-Which statement about the effects of toxin from bacteria strain B is true?

A) Toxin from bacteria strain B is more lethal than toxin from strain A.
B) Toxin from bacteria strain A is more lethal than toxin from strain B.
C) Injection with a sublethal dose of toxin from bacteria strain B provides more benefit than injection with serum from an unexposed animal.
D) Toxin from bacteria strain B is as lethal as toxin from strain A.
E) The diagram provides insufficient information to reach a conclusion about the effects of toxin from bacteria strain B.