Questions $15-17$ based upon the following Information

Two Separate Subway Sandwich Shop store owners $2$ miles away from each other $($Blake and Abby$)$ produce two goods $($Chocolate Chip Cookies and Subway Sandwiches$).$ Consider their production decision over the course of a day. Each person is producing at full capacity at the levels below so any change in production of one item reflects a corresponding change in the other item.

Chocolate Chip Cookies: $,$ Subway Sandwiches:

$\backslash$table$[[$Blake:$,160$ per day,$40$ per day$],[$Abby:$,160$ per day,$24$ per day$]]$

For every Subway Sandwich that Blake produces, what is his Opportunity Cost expressed in Chocolate Chip Cookies?

$4$

$\frac{1}{2}$

$\frac{1}{4}$

$2$