Final answer:
The correct operation to get the string 'st' is s + t.
Step-by-step explanation:
In this question, we are given two strings: s = 101 and t = 10. We need to determine which operation would result in the string 'st'.
The correct answer is a. s + t. When we use the + operator with strings, it concatenates them together. So, s + t would result in '10110', which is equal to st.
The other options of s * t, s / t, and s - t do not make sense when performing operations on strings.