Below is a list of resources. Indicate whether each is labour, capital, land, or enterprise.

a$.$ An irrigation ditch in Manitoba. This is

$($Click to select$)vv$

b$.$ The work done by Jim Plum, a labourer who helped dig the irrigation ditch. This is $($Click to select$)vv$

c$.$ A lake. This is $($Click to select$).$

d$.$ The air we breathe. This is

e$.$ The efforts of the founder and primary innovator of a successful new software company. This is $($Click to select$)vv$