The answer is B. The program prints:
R

Why?
word[2:3] is a slice: it starts at position 2 and stops before position 3. Positions count from 0.
Trace table
A trace table follows the program step by step. Here’s this one:
| position | letter |
|---|---|
| 0 | T |
| 1 | U |
| 2 | R |
| 3 | T |
| 4 | L |
| 5 | E |
The code again
word = "TURTLE"
print(word[2:3])
Try it: change one number in the program and predict the new output before you run it.