Association areas are mostly located in the cerebral cortex and they process the information coming from the sensory areas such as hearing, vision etc.
The association area for sight is located in the occipital lobe and it's name is striate cortex. It's main function is to process the signals coming from the eye.
The association area for hearing is located in the temporal lobe and it's main function is to process the information coming from the ears.
The association area for touch or the sensory association area is located in the cerebral cortex and it's main function is to process the signals coming from the sensory stimuli outside the body.
An opaque object is any object that is not transparent (allowing all light to pass through it), or translucent (allowing some light to pass through it.) Knowing this we can auto-matically dismiss option D),B), and C) because these all let some form of light through them so our answer would then be A) because light does not pass through wood like it would the others.
