To find the expression equivalent to \(-3(2y - 5)\), we can distribute \(-3\) to both terms inside the parentheses.
\[ -3(2y) + (-3)(-5) \]
Calculating each term:
\[ -3 \cdot 2y = -6y \] \[ -3 \cdot -5 = 15 \]
Now, combining these results:
\[ -6y + 15 \]
Thus, the equivalent expression is:
\(-6y + 15\).
The correct option is:
B: \(-6y + 15\).