Refer to Figure $3\mathrm{.}4$: Customer Needs Importance $($p$.59).$ What does it mean to have a higher slope in this graph from the LUNCH EXPRESS example?

O a$.$ The higher the slope the more important the need is to the overall customer satisfaction.

$$ b$.$ The higher the slope the more money a company needs to invest to fulfil it$.$

O c$.$ The needs with higher slope are less important to the clients.

O d$.$ The needs with higher slopes are harder to cater too.