Final answer:
Syntax can most accurately be defined as the set of language rules that Access follows when evaluating expressions.
Step-by-step explanation:
The most accurate definition of syntax is option d. Syntax refers to the set of language rules that a programming language like Access follows when evaluating expressions. These rules determine how expressions are structured and organized. For example, in Access, syntax rules dictate the proper order and usage of keywords, operators, and other elements when writing a query or performing calculations.