From statement (b), Red no. car + Silver no. car = odd number
So the possibilities are (Red, Silver) = (Odd, even) or (even, odd), because
|even-odd| = odd number
From statement (a), White no. car + Red no. Car = Even number
So the possibilities are (Red, White) = (Even, Even) or (Odd, odd)
But in statement (h), we are given white colored car is even in number so the 2nd possibility of white colored car being odd in number can be ruled out.
So, White colored car is even and so is red color car. This gives us Silver colored car being odd in number.
Now Aman and Daniel own same numbered car and Eric owns an odd numbered car. So Aman and Daniel must own an even numbered car, because there are only two odd numbered cars (from statement (d)).
Charu owns silver colored car. So it will be odd in number (already established above).
So Charu and Eric own odd numbered car and rest all own even numbered car.
Biju owns gold colored car. So Eric who owns an odd numbered car cannot own gold, silver, blue, red and white colored cars. So he owns a black colored car.
So, collating all the information above, we have,

Black is an odd numbered car and so is silver. Only odd * odd can make an odd number.