What is an extrasolar planet?
a. a planet that is considered an "extra," in that it was not needed for the formation of its solar system.
b. a planet that is extra large compared to what we'd expect.
c. a planet that is larger than the sun.
d. a planet that orbits a star that is not our own sun

option (d)

Explanation:

The extra solar planet is also called as exo planet.

the planet which orbits around the star other than sun is called exo planet.

So, a planet that orbits a star that is not our own sun.

Thus, option (d) is correct.

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.