The context in public speaking

a.

is also known as the content.

b.

is the information the speaker has chosen to share.

c.

is closely related to the message.

d.

all of the above

D. all of the above.

Explanation:

explanation: the line "to save the day, harry must get past a scary three-headed guard dog" from the summary best justifies the conclusion that harry potter and the sorcerer’s stone was influenced by ancient greek mythological literature. the three other choices had nothing to do with ancient greek literature - and the words "three-headed guard dog" are what makes that choice the correct answer.