The answer would be “but” since it contrasts his motivation with competing with others for a high score.
Hopefully this helped.
Answer:
It gives a example of the theme because in the title should give the main idea/ theme
Explanation:
I believe it is A due to "The lady made detailed plans, engaged the caterer and the orchestra well in advance" isn't exactly connect well and be hard to understand so you'd put a comma between "caterer, and".
