Continued exposure to the same stressor or additional stressors drain…

The correct answer is Option (3) → (A) and (C) only

In the exhaustion stage, the third stage of Selye’s General Adaptation Syndrome, the physiological systems involved in alarm reaction and resistance become ineffective.

(A) susceptibility to stress is increased Correct. With the body’s resources drained, susceptibility to stress-related diseases such as high blood pressure becomes more likely.

(B) capacity to resist is excellent Incorrect. Resistance belongs to the second stage. By the third stage the body’s resources are drained and the systems of resistance have become ineffective, so the capacity to resist is at its lowest.

(C) it can even lead to death Correct. When the drained body can no longer resist, the breakdown can go as far as death (see the Note).

(D) susceptibility to illness decreases Incorrect. It is the reverse: susceptibility to stress-related diseases increases in this stage.

Note: NCERT (2025-26) says that in the exhaustion stage the physiological systems become ineffective and susceptibility to stress-related diseases becomes more likely; it does not mention death. Statement (C) comes from Selye’s own account of the General Adaptation Syndrome, in which an organism whose resources are wholly used up may die. The answer still follows from the book: (A) is true and (B) and (D) are false, and Option (3) is the only option that has (A) without (B) or (D).