Final answer:
To triple the value of a variable 'distance' using an augmented assignment operator, use the syntax 'distance *= 3'. This line of code will multiply 'distance' by 3.
Step-by-step explanation:
To triple the integer value stored in a variable distance using an augmented assignment operator, you should use the *= operator. This operator is used to multiply the current value of the variable by a given factor and then assign the result back to the variable. To achieve this, the correct syntax would be distance *= 3. This line of code will multiply the value of distance by 3 and then update distance to this new value. This is a concise way to apply an operation to a variable and assign the result to the same variable in programming languages like Python, Java, and C++.