I think it’s B
Hope that helped XD
The correct answer is muscular. When you work out, you are using your muscles to help you perform well during fitness exercises. When your muscles are overused, you will feel sore the next day because your muscles had to work hard.
It is because the “building” word that denotes infrastructures is a gerund. Gerunds are nouns that came from verbs + a suffix “ing". So in this case, “building” comes from the verb “built" (which implies that something is already done building something) + the “-ing”.
