Parsec is the unit of

Correct option is B

Parsec is a unit of distance used in astronomy.

Explanation:

● A parsec (short for "parallax-second") is a unit of distance equivalent to 3.26 light-years or approximately 30.86 trillion kilometers (19.1 trillion miles).
● It is defined as the distance at which an object would have a parallax angle of one arcsecond when observed from two points separated by one astronomical unit (AU).
● Parsecs are used to measure large astronomical distances between celestial objects like stars and galaxies.

Information Booster:

● 1 parsec = 3.26 light-years = 206,265 astronomical units (AU).

● The term "parallax" refers to the apparent shift in the position of a nearby object when observed from two different vantage points.
● Astronomers use parsecs instead of light-years for precision in calculating distances to stars and galaxies.

Additional Information:

• (A) Time: Parsecs are unrelated to time; time is measured in units like seconds or hours.
• (C) Frequency: Measured in hertz (Hz), unrelated to parsecs.
• (D) Angular acceleration: Measured in radians per second squared, not parsecs.