Step 1: Analysis of Other Options
- Texture Profile Analyzer (B): It is used to measure the texture of foods, such as hardness, but not directly related to morphology or chewiness in the way suggested.
- Differential Scanning Calorimeter (C): This instrument measures heat flow and is not typically used to measure the degree of caking as its primary function.
- Capillary Viscometer (D): A capillary viscometer measures viscosity but is not related to sensory properties in this context.
Final Answer: \[ \boxed{\text{(A) Particle size analyzer - particle size distribution - span value}} \]