Answer:
The answer is (C) Father’s English started improving.
Step-by-step explanation:
It said "Then came our dinner at Lakeview restaurant." but it didn't say they were there yet. On the second paragraph, it states, "Father wanted to celebrate, because he had just been promoted. He worked for an electronics company, and after his English started improving, his superiors decided to appoint him to a position more suited to his training." This means they went to the restaurant to celebrate the dads promotion.