Give reason happiness is not a physical quantity

e cannot measure love, feelings, happiness, afraid etc. So these are not the physical quantities. Physical quantities can be categorized into two types:

arious happenings in life e.g., happiness, sorrow etc. are not physical quantities because these can not be measured. ... Thus while expressing definite amount of physical quantity, it is clear that as the unit(u) changes, the magnitude(n) will also change but product 'nu' will remain same.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

i would say b

explanation:

but i think i would need more information than that