Final answer:
The digit located at the 309th decimal place of Pi is 7. The correct option is D) 7.
Step-by-step explanation:
The digit found at the 309th decimal place of Pi is a 7. To find this out, you can use online resources or software that can calculate Pi to a high number of decimal places. Pi is an infinite, non-repeating decimal, which means the digits after the decimal point continue infinitely without repeating a pattern.
Since the digits of Pi are fixed, once you have calculated them, the digit in the 309th decimal place will always be the same, and in this case, it's a 7. Hence, D is the correct option.