Explanation:
\(-\frac23\)
If 3x + 2 = 0, then
3x = -2 (Transposing +2 to R.H.S.)
\(\Rightarrow\text{x}-\frac{2}{3}\)
So, the zero of 3x + 2 is \(-\frac23.\)
Note: A zero is that number, when put in place of the variable, makes the expression equal to zero.
Hence, the correct alternative is option (c).