The correct answer is A. Hard skills
Step-by-step explanation:
Hard skills refer to abilities or expertise you learn through education or experience, for example, knowing how to drive a car or how to design a web page are hard skills. Besides this, hard skills differ from soft or interpersonal skills because in most cases they are not related to interaction with other people. According to this, preparing a presentation, rebuilding a car and solving equations are all hard skills because these are the result of education or specific knowledge and experience; also, these are not directly related to interpersonal or soft skills.