A person with dyslexia has difficulty in

Concept: Specific Learning Disabilities (SLDs) are neurodevelopmental disorders that affect a child's ability to acquire one particular academic skill despite normal intelligence and adequate instruction. Dyslexia is the SLD affecting written-language processing — specifically the ability to accurately and fluently recognize words, decode letter-sound relationships, and spell (orthographic memory).

Application: Applying this definition to the stem — the defining feature of dyslexia is impaired reading and spelling, not difficulty with speech production, verbal/written expression, or motor skills. Among the given options, only the reading/spelling skill area matches dyslexia's diagnostic profile.

Cross-check (why the other options don't fit):

• Speaking — difficulty in spoken articulation/production is characteristic of a speech/articulation disorder, a separate diagnostic category.

• Expressing — difficulty expressing thoughts verbally or in writing composition is associated with an expressive language disorder or dysgraphia, not dyslexia specifically.

• Standing — difficulty with balance, posture, or motor coordination relates to developmental coordination disorder (dyspraxia), unrelated to dyslexia.

Result: Reading/Spelling is therefore the correct description of dyslexia's core difficulty.