Which statement is true about the polynomial
5s6t2 + 6st9 – 8s6t2 – 6t7 after it has been fully simplified?

A. It has 3 terms and a degree of 9.
B. It has 3 terms and a degree of 10.
C. It has 4 terms and a degree of 9.
D. It has 4 terms and a degree of 10.