The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
"She is not rich / and that is why, she cannot afford to / buy a expensive bungalow / near the sea-side."

Explanation of the Correct Answer:
· The incorrect part is "buy a expensive bungalow."
· The article "a" should be replaced with "an" because "expensive" starts with a vowel sound.
· The correct phrase should be "buy an expensive bungalow."
Other options:
· (a) "near the sea-side" → Correct; grammatically fine.
· (b) "She is not rich" → Correct; no error.
· (c) "and that is why, she cannot afford to" → Correct; grammatically correct.
Thus, the correct answer is (d) buy a expensive bungalow (should be "an expensive bungalow").