Mountain bikes were originally the product of A consumer demand. B military inventiveness C safety concerns D technological innovation

## Step 1<br />The question is asking about the origin of mountain bikes. Mountain bikes, also known as off-road bikes, were originally developed as a response to the need for a bike that could handle rough terrain. This need arose from the desire of cyclists to explore areas that were not accessible by regular road bikes.<br />## Step 2<br />The options provided are: A) consumer demand, B) military inventiveness, C) safety concerns, and D) technological innovation. We need to identify which of these best explains the origin of mountain bikes.<br />## Step 3<br />Mountain bikes were not initially developed due to military inventiveness, safety concerns, or technological innovation. They were developed due to consumer demand. Cyclists wanted a bike that could handle rough terrain, and this demand led to the creation of mountain bikes.