The number that is divided is called the dividend and the number which the dividend is being divided by is the divisor. The answer to a division problem is the quotient.
In the given question 2 10 1 5 is being divided by -5
So 2 10 1 5 represent the dividend .These numbers are the coefficients of the constants which are arranged in descending order.The dividend can be written as :

The second option is the right answer.