Where in the passage dose the author describe an active plant-defense reaction?

Ở đâu trong đoạn văn, tác giảmiêu tảmột phảnứng phòng vệthực vật chủ động?

A. Dòng 1-3                B. Dòng 13-15                        C. Dòng 19-23            D. Dòng 4-6

Dẫn chứng: Active plant defense mechanisms are comparable to the immune system of vertebrate animals,although the cellular and molecular bases are fundamentally different. Both, however, are triggered in reaction to intrusion, implying that the host has some means of recognizing the presence of a foreign organism. The most dramatic example of an inducible plant defense reaction is the hypersensitive response.

Chọn đáp án là C