In standard letter format, the (a) enclosure notation appears ...

[SAVANNAHHOOPER23]

In standard letter format, the
 
  (a) enclosure notation appears before the complimentary closing.
  (b) inside address appears above the date.
  (c) senders address is omitted.
  (d) senders signature appears above the complimentary closing.
  (e) heading appears above the date.

Question 2

In an adjustment letter,
 
  (a) offer an incentive if appropriate.
  (b) apologize in passive voice.
  (c) use active voice to explain the customers mistake.
  (d) offer an incentive, if appropriate, and apologize in passive voice.
  (e) All of these answers are correct.

[ndhahbi]

Answer to Question 1

e

Answer to Question 2

a

[SAVANNAHHOOPER23]

Excellent

[robbielu01]

Thanks for the timely response, appreciate it