Final answer:
Education is a social institution that is highly regarded and can be formal or informal.
Step-by-step explanation:
A. It is a social institution.
B. It is held in high regard in most societies.
C. It can be formal or informal.
D. All of the above are correct.
Education is a social institution through which members of a society are taught basic academic knowledge, learning skills, and cultural norms. It is held in high regard in most societies and can be both formal and informal. Therefore, the correct option is D. All of the above are correct.