Metre/sec
Sec
Para/sec
Parsec
Answer is Right!
Answer is Wrong!
The correct answer is D. Parsec.
A parsec is a unit of astronomical distance equivalent to the distance at which one astronomical unit subtends an angle of one arcsecond. One parsec is equal to about 3.26 light-years, or 30.86 trillion kilometers.
A metre per second is a unit of speed, not distance. A second is a unit of time. A parallax second is a unit of angular measurement, not distance.
Parsecs are used to measure distances to stars and other objects outside the Solar System. They are also used to measure the size of galaxies and other large astronomical objects.