If an Op-Amp's Output Increases 6 V Every $\mu \mathrm { s }$

Multiple Choice

If an op-amp's output increases 6 V every 18 $\mu \mathrm { s }$ in response to a step input voltage, the slew rate equals________

A) 33 $\mathrm { V } / \mu \mathrm { s }$
B) 0.33 $\mathrm { V } / \mu \mathrm { s }$
C) 0.99 $\mathrm { V } / \mu \mathrm { s }$
D) 3 $\mathrm { V } / \mathrm { \mu s }$