Final answer:
The default rural interstate highway speed limit varies by state, typically ranging from 65 to 85 mph, and cannot be determined accurately without specific state context or reference to course materials.
Step-by-step explanation:
In areas without a speed limit sign, the default speed limit on a rural interstate highway can vary by state. However, the question does not specify a particular state. Therefore, it's not possible to give an accurate answer without additional context. Federal law no longer mandates a maximum speed limit, and states can set their own limits, typically ranging between 65 to 85 mph for rural interstates.
It's important to check the specific laws of the state you are in. On the other hand, if this question is from a textbook or a specific course's material, you should refer to the answer provided by that resource.
In areas without a speed limit sign, the speed limit on a rural interstate highway is determined by the default speed limit set by the state or country. This default speed limit may vary, but in most cases, it is around 55 mph or 88 km/h. However, it's important to note that this can vary depending on the specific jurisdiction, so it is always best to follow any posted speed limit signs and laws in the area you are driving in.
Therefore the correct Option is A) 70mph.