Final answer:
The diamond egg can be obtained in the 30 bee zone by purchasing it from the A) Pro Shop.
Step-by-step explanation:
The correct answer is A) Pro Shop.
In the 30 bee zone, you can get a diamond egg by purchasing it from the Pro Shop. The Pro Shop offers a range of bee-related items and upgrades, including special eggs such as the diamond egg. By spending honey or tokens, you can acquire the diamond egg and add it to your collection.
Obtaining a diamond egg can provide unique benefits and rewards in the game, so be sure to save up enough resources to purchase it from the Pro Shop.