Option 1 -> Trees explicitly "stand enduring the scorching heat of the sun" while giving shade - a clear example of endurance.
Option 2 -> Sugarcane "is pressed" to yield juice - involves tolerating physical stress/pain, exemplifying endurance.
Option 3 -> Trees bearing fruit and flowers spreading fragrance are described as selfless service, but involve no pain, hardship, or endurance - these are natural processes.
Option 4 -> Henna "being ground into a paste" - mentioned in context of tolerating pain for service, exemplifies endurance.
Hence, Option 3 -> The passage uses examples of endurance specifically in the context of "tolerating pain for the sake of service to others." Bearing fruit and spreading fragrance are natural, effortless processes that involve no suffering or hardship, unlike being scorched by heat, pressed, ground, or pierced. These simply represent selfless service without the element of endurance -> correct