Which of the Following Represents the Equation for a First-Order $t 1 / 2 = \frac { 1 } { k [ \mathrm {~A} ] _ { 0 } }$

Which of the following represents the equation for a first-order half-life?

A)
$t 1 / 2 = \frac { 1 } { k [ \mathrm {~A} ] _ { 0 } }$
B) $t 1 / 2 = \frac { 0.693 } { k }$
C) $t 1 / 2 = \frac { [ \mathrm { A } ] _ { 0 } } { 2 k }$
D) $t 1 / 2 = \frac { 2 k } { [ \mathrm {~A} ] _ { 0 } }$
E) $t 1 / 2 = \frac { k } { [ \mathrm {~A} ] _ { 0 } }$