Select "yes" for those statements below that are accurate and choose $"$no$"$ for those that are not.

$4\mathrm{.}16$

a$.$ The rivalry among Under Armour and its competitors in the market for athletic apparel, footwear, and accessories is quite strong and seems to be on the verge of growing more intense.

b$.$ Rivalry is being driven by three main factors: product quality, styling, comfort, and performance issues; product line breadth, and brand image and brand reputation.

c$.$ Fast$-$growing demand for performance sports apparel causes each rival to quickly introduce apparel that is not necessarily differentiated in order to meet demand.

$($Click to select$)vv$