Read the closing from a formal e-mail. talk to you later: which is the best way to revise the closing? a. warmly: b. respectfully: c. yours truly: d. see you soon:

B). Respectfully.

Explanation:

A formal mail as the title suggests is described as the mails usually composed for business purposes or to unknown persons or authority. Such emails employ a formal language in order to produce an effective response from them.  

As per the question, the best way to revise the closing 'talk to you later' of a formal email would be 'respectfully' as it proposes a formal tone to the e-mail that would offer a professional mood and create the desired impact. It would also help avoid the use of informal language as it may affect the efficacy of the message. Thus, option B is the correct answer.