Previously, management calculated the number of kanban cards allowed by using a value of $1\mathrm{.}3$ for X$.$ Assuming nothing else $($e$.$g$.,$ usage rates, container capacities, etc.$),$ which of the following values for X would indicate management's belief that the system has become more efficient?

Multiple Choice

$2\mathrm{.}6$

$2\mathrm{.}3$

$1\mathrm{.}5$

$1\mathrm{.}4$

$1\mathrm{.}2$