Final answer:
The integer -200 correctly represents a depth of 200 feet below sea level, making option A the correct answer.
Step-by-step explanation:
The question asks to write an integer representing 200 feet below sea level. The correct representation of a depth below sea level in mathematics is with a negative sign before the number. Therefore, the integer that represents 200 feet below sea level is -200.
So, the correct answer is: A) -200.