The correct answer is C. PL/M.
PL/M is a high-level programming language developed by Gary Kildall at Intel in 1972. It was designed for use in embedded systems, and was one of the first languages to be used for microcomputers. PL/M was used to develop the operating system for the Intel 8080 microprocessor, and was also used to develop the first IBM PC.
PL/M is a procedural language, and is based on the PL/I language. It features a number of features that make it well-suited for embedded systems programming, such as support for bit manipulation, pointers, and interrupts. PL/M is still in use today, and is supported by a number of compilers and development tools.
The other options are incorrect. PL/C is a high-level programming language developed by IBM in the 1960s. It is a compiled language, and is based on the PL/I language. PL/CT is a variant of PL/C that is designed for use with microcomputers. PLA is a programming language developed by the United States Air Force in the 1960s. It is a procedural language, and is based on the ALGOL language.