Answer:
What sources? WILL ANSWER in comments
Answer: The number of players and spectators present, as well as the maximum number of players and spectators allowed.
Explanation: players
D. All of the above.
<u>Reason:</u>
A. Fences can get in the way of a beautiful picture.
B: The animal's enclosure may be hard to get the perfect snap. Like a rock can be in the way of the animal. idk...lol
C. People want to see the animal as much as you do so they may block the way of a picture.
Example from Google..XD