Which word or phases are context clue that you figure out the meaning of the word casually

D Is the right answer

Explanation:

He acted cool and casual are the same thing "He acted cool" can describe what they are like & "natural behavior"  could give you a reason where people are nervous to talk to girls

apprenticeships are formal, paid, long-term training programs that provide valuable classroom instruction coupled with on-the-job training for skilled, high-paying jobs.