Вопрос из теста по предмету Английский язык

Question

Personal computers (or microcomputers) were made possible by two technical innovations in the field of microelectronics: the integrated circuit, or IС, which was developed in 1959 and the microprocessor that first appeared in 1971. The IС permitted the miniaturization of computer-memory circuits, and the microprocessor reduced the size of a computer’s CPU to the size of a single silicon chip.
Because a CPU calculates, performs logical operations, contains operating instructions, and manages data flows, a complete microcomputer as a separate system was designed and developed in 1974.
Основной идеей текста является …

Answer

Personal computers were made possible by the single silicon chip and the microprocessor.

Answer

Personal computers were made possible by the computer-memory circuits and the microprocessor.

Answer

Personal computers were made possible by logical operations and the operating instructions.

Answer

Personal computers were made possible by the integrated circuit and the microprocessor.

Personal computers or microcomputers were made possible by two technical innovations in the field of...: ответ на тест 1006895 - Английский язык