The correct option is D Oh, no, that's awful!
Exclamatory adjectives are words or phrases that express sudden or strong emotions.
The passage is a conversation between two individuals, Neera and Amina. From Amina's dialogues, one can figure that she is complaining about her work and isn't happy.
The sentence in question is: Also, we aren't allowed to leave till the last customer's gone, and sometimes that's around midnight!
The phrase that must follow is a reaction to this sentence. Since the sentence expresses displeasure, the reaction too must be negative.
Options A and C express delight, both are positive reactions, but they cannot be given to a negative statement. (lines that support negative meaning: "yuck!", "The worst thing is..." and "I'll hopefully find something better...")
Hence, A and C are incorrect.
Between options B and D, the latter is more suitable. 'Oh no, that's awful!' is a reaction to something that is awful, terrible. The sentence before the blank (4) states something that would be regarded as awful. Hence, option D is correct.
'No, that's terrifying' refers to something that is terrifying (cause fear or terror; it does not mean the same as 'terrible'). The sentence 'Also, we aren't allowed..." does not indicate the emotions of fear or terror. (Moreover, 'No, that's terrifying' is not a reaction, as the word 'oh' is essential for an exclamation) Hence, option B is incorrect.