The Market for Smartwatches Has Begun to Grow, Due in Part

The market for smartwatches has begun to grow, due in part to the success of the Apple Watch.Following the successful launch of the Apple Watch in 2015, companies such as Samsung, Sony, and LG have all developed products to compete with the Apple Watch.The smartwatches introduced to compete with the Apple Watch would be considered

A) complements to the Apple Watch.
B) substitutes for the Apple Watch.
C) inferior goods compared to the Apple Watch.
D) normal goods compared to the Apple Watch.