In each of the question below, four sentences are given. Find out which of the following sentences is/are incorrect grammatically or contextually. Choose the option that correctly identifies the incorrect sentence(s). (

• A The neuroplasticity of the adult human brain — once considered to be essentially fixed after early childhood developmental windows closed — has been demonstrated through decades of experimental research to remain substantially responsive to learning, experience, and targeted therapeutic intervention well into old age. (
• B Cognitive dissonance, first theorised by Leon Festinger in 1957, refers to the psychological discomfort that arises when a individual simultaneously holds two or more contradictory beliefs, values, or attitudes — and predicts that the resulting tension will motivate behaviour designed to reduce the inconsistency through belief revision, rationalisation, or selective attention. (
• C The placebo effect, long dismissed as a mere confound that clinical trial methodology was designed to control for, has been reconceptualised by contemporary psychobiological research as a genuine neurobiological phenomenon involving measurable changes in endogenous opioid activity and dopaminergic pathways that mediated the subjective experience of symptom relief. (
• D Embodied cognition theory challenges the classical computational model of mind by proposing that cognitive processes are not exclusively implemented in the brain but are fundamentally shaped by the configuration of the body, the dynamics of motor activity, and the structure of the physical environment within which cognition occurs.