The correct answer is A. C program.
An imperative language is a programming language that describes how a computer program must change the state of an execution environment from one step to the next. This contrasts with declarative programming, where the program describes the desired final state of the execution environment.
C is a general-purpose, procedural computer programming language supporting structured programming, lexical variable scope and recursion, while a SQL (pronounced "sequel") is a programming language designed for managing data in a relational database. XQuery is a declarative programming language for querying XML data. Concurrent model of HDL is a model of computation that describes the behavior of concurrent systems.
Imperative languages are often used for systems programming, where the programmer has complete control over the execution environment. They are also used for application programming, where the programmer needs to be able to control the flow of execution.
Declarative languages are often used for data manipulation and analysis, where the programmer does not need to be concerned with the details of how the data is stored or accessed. They are also used for artificial intelligence and machine learning, where the programmer needs to be able to express complex relationships between data.