For Which Reason Is Clavulanate Included in Some Formulations of β-Lactam

For which reason is clavulanate included in some formulations of β-lactam drugs?

A) blocks formation of cell wall precursors
B) prevents cross-linking of cell wall peptides
C) inhibits renal tubular secretion of β-lactam drugs
D) inhibits bacterial degradation of β-lactam drugs
E) inhibits renal degradation of β-lactam drugs