D. Both b and c is the answer
Fossil fuels are made of decayed plants and animals by being exposed to extreme heat or pressure from the crust of earth!! Hope this helps
The word is Conventional.
A unit of acceleration needs a unit of length in the numerator
and a squared unit of time in the denominator.
Example: meters / second²
feet / minute²
smoots / hour²
furlongs / fortnight² .
Ideally, in order to completely describe an acceleration vector,
you also need to state a direction.