Answer:
C. It takes diligence and hard work to succeed in life.
Step-by-step explanation:
Abstract nouns are nouns that name things that are not concrete, that is to say, things that we can not detect with either of our five senses (smell, taste, sight, hearing, and touch). Examples of this type of nouns are ideas, theories, feelings, emotions, conditions, events, like death, birthdays, marriage, qualities and intangible concepts like "diligence" which refers to a careful and persistent work or effort and "hard work" because they are things we can not interact with or detect with our five senses).