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I had one of those once, and it did not have a unit.

What was it then?

What is the unit of Pi?

No unit

what a unit of 25ºC

Can be converted to Fahrenheit units by a sharp student.

so the answer is (c) may have a unit. Other definition for dimensionless quantity is scalar quantity

Yeah But give an example
with a unit and without a unit!

I need Examples
One is temperature with a UNiT!
So without unit?

In my humble opinion, the best answer would be "a"

ohh why!?

Pi has no unit, just a value and an irrational value at that.

I desagree:
http://en.wikipedia.org/wiki/Dimensionless_quantity

So why is it not unitless?

oh yes!

Review that link provided by @rkparth5770 and make a decision.

What?!
i did not provide any

Thanks @rkparth5770 for providing additional info on this "dimensionless" subject.

Hmmm... in my physics book, Planck's constant is 6.626...x10^(-34) Js , which is with a unit :S