${?}_{{?}_{{?}_{?}}{?}_{i}s\text{o}\text{n}\text{e}of\text{t}\text{h}\text{e}\text{f}\text{o}\text{r}\text{c}\text{e}\text{s}of\text{t}\text{h}\text{e}\text{F}\text{i}\text{v}\text{e}\text{F}\text{o}\text{r}\text{c}\text{e}\text{s}\text{M}\text{o}\text{d}\text{e}\text{l}\text{c}\text{r}\text{e}\text{a}\text{t}\text{e}\text{d}by\text{M}\text{i}\text{c}\text{h}\text{a}\text{e}\text{l}\text{P}\text{o}\text{r}\text{t}\text{e}\text{r}\text{.}}$

Question $8$Select one:

$a.$

Rivalry among customers

$b.$

Government regulations

$c.$

Threat $of$ new entrants

$d.$

Taxable services