The correct answer is D. PASCAL.
PASCAL is a high-level, procedural programming language that was designed by Niklaus Wirth in the early 1970s. It is a structured programming language, which means that it emphasizes the use of modules, functions, and subroutines to organize code. This makes it well-suited for writing complex programs that are easy to understand and maintain.
PL/1 is a general-purpose programming language that was developed by IBM in the late 1960s. It is a compiled language, which means that it is converted into machine code before it is executed. PL/1 is a powerful language that can be used to write a wide variety of programs, but it is not as well-suited for structured programming as PASCAL.
FORTRAN is a high-level, scientific and engineering programming language that was developed by IBM in the early 1950s. It is a compiled language that is designed for numerical computation. FORTRAN is a powerful language that is still widely used in scientific and engineering applications, but it is not as well-suited for structured programming as PASCAL.
BASIC is a family of high-level programming languages that were developed in the early 1960s. It is an interpreted language, which means that it is converted into machine code line by line as it is executed. BASIC is a simple language that is easy to learn, but it is not as well-suited for structured programming as PASCAL.
Therefore, the correct answer is D. PASCAL.