Which sentence is appropriate for formal e-mail?

D. Schools should offer personal finance classes to teach basic economics.

A formal e-mail has a different tone and choice of words. In an informal e-mail, slang, figures of speech, and broken syntax are included; informal writing is a lot more similar to a spoken conversation.
By saying "I mean" and "hook kids up," the writing is more similar to a spoken conversation rather than formal writing.

Dr.king , i would take my mental flight by egypt and i would watch god’s children in their magnificent trek from the dark dungeons of egypt through, or rather across the red sea, through the wilderness on toward the promised land.his  speech"i  have a dream" to encourage people that change will come. this  speech  was very important during the civil rights movement and was a contributing factor in the end of racial injustice in society. the  intended audience  of "i  have a dream" is white people. i hope this

The answer is c: distinguish. which means tell the difference between two or more things