The degree of the expression is 20, the degree of each term of the expression after expansion will be 20.
We have to divide 20 into three parts which can be done by using the distribution rule
${^{n+r-1}C_{r-1}}$
Where,
n is number of things to be distributed.
r is number of parts into which the things are to be distributed.
${^{20+3-1}C_{3-1}}={^{22}C_{2}}$
=$\frac{22 \times 21}{2}$
=231
Hence,OPtion(A)231.