What does the word "They" in paragraph 3 refer to? 

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

Mark the letter A, B, C, or D to indicate the correct option that best fits each of the numbered blanks from 18 to 23.

a. Additionally, the dining area was unclean, with sticky tables and food crumbs on the floor.

b. I look forward to hearing from you regarding the actions taken to rectify these concerns.

c. Dear Sir or Madam, I am writing to express my disappointment with the service at your restaurant last Sunday.

d. I kindly request that you address these issues promptly and take steps to ensure they do not happen again in the future.

e. Yours faithfully,

f. The waitstaff seemed overwhelmed and inattentive, and the food quality was subpar.

Mark the letter A, B, C, or D to indicate the correct option that best fits each of the numbered blanks from 24 to 28.

Mark the letter A, B, C, or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

Read the following advertisement/school announcement and mark the letter A, B, C, or D to indicate the correct option that best fits each of the numbered blanks from 10 to 12.

Mark the letter A, B, C, or D to indicate the correct option that best fits each of the numbered blanks from 24 to 28.