سوال ۱۲ کنکور ارشد مهندسی مکانیک ۱۴۰۴

PART C: Reading Comprehension — Read the following passage and answer the question by choosing the best choice (1), (2), (3), or (4).

PASSAGE 1 (paragraph 1):

Mechanical engineering is a diverse and dynamic field that combines principles of physics, mathematics, and material science to design, analyze, and manufacture mechanical systems. It plays a crucial role in various industries, including automotive, aerospace, energy, and manufacturing. Mechanical engineers are tasked with solving complex problems and creating innovative solutions, often utilizing Computer-Aided Design (CAD) software to visualize and optimize their concepts. From developing efficient engines and advanced robotics to enhancing renewable energy systems, the contributions of mechanical engineering are pivotal in driving technological progress and improving everyday life.

The underlined word "their" in paragraph 1 refers to «..........» .