Use the Following Information When Answering the Corresponding Questions)

Use the following information when answering the corresponding questions) .
Researchers found that high doses of nitric oxide were not lethal to soybean cells. Likewise, high doses of reactive oxygen intermediates were not lethal to soybean cells. However, when combined, nitric oxide and reactive oxygen intermediates wer lethal to soybean cells. M. Delledonne et al. 2001. Signal interactions between nitric oxide and reactive oxygen intermediates i the plant hypersensitive response. Proceedings of the National Academy of Science, USA 9823) :13454- 59.)
-Why would the researchers study the association between cell death, nitric oxide, and reactive oxygen intermediates?

A) to gain insight into how R proteins recognize avr proteins
B) to gain insight into what happens after R- avr protein binding
C) to gain insight into how pathogens kill plant cells
D) to gain insight into how R genes are inherited