Hard skills are teachable abilities or skill sets that are easy to quantify. Examples of hard skills include: proficiency in a foreign language, a degree or certificate, typing speed, machine operation, computer programming. These hard skills are often listed in your cover letter and resume, and are easy for an employer or recruiter to recognize. What is the meaning for “quantify”?
选项：

A:Qualify
B:Calculate
C:To describe or express by numbers
D:Acquire