Why would the PPF described in #$2$ be bowed outward?

The PPF would be bowed outward if

A$.$ less and less agricultural production must be given up for each given increase in household

Question $5$

production

B$.$ more and more agricultural production must be given up for each given increase in household production

Question $7$

C$.$ the opportunity cost of household production is constant

Question B

D$.$ the demand for water is constant

$5.$ Graphing Question

Draw a PPF for an area with agricultural production and household production that shows increasing