Choose the expression that represents the sixth term in the binomial expansion of (5y + 3) 10.

A) 10C5 (5y) 5 (3) 5

B) 10C6 (5y) 4 (3) 6

C) 510C5 (y) 5 (3) 5

D) 510C6 (y) 4 (3) 6

To find for the sixth term of the binomial expansion, we can use the equation written as:

rth term = nC (r-1) x^n-r+1 y^r-1

6th term = 10C5 (5y) ^10-6+1 3^6-1

6th term = 10C5 (5y) ^5 3^5

Therefore, the correct answer is option A.