To factor the expression \(-20x - 5y\), we start by identifying the greatest common factor (GCF) of the terms:
- The coefficients are \(-20\) and \(-5\). The GCF of \(-20\) and \(-5\) is \(-5\).
- Next, we factor out \(-5\) from the expression:
\[ -20x - 5y = -5(4x + y) \]
Thus, the correct factorization is:
\(-5(4x + y)\)
Therefore, among the provided options, the most appropriate choice is:
−5(4x+y).
(Note: the correct options provided previously should include \(-5(4x + y)\) instead of \(-5(4x - y)\)).