Final answer:
If line segment RT bisects line segment SU, statement A) RS=UT and S is the midpoint of RU is true.
Step-by-step explanation:
If line segment RT bisects line segment SU, it means that RT cuts SU into two equal parts.
In other words, RS is equal to UT and RU is divided into two equal parts by point S, making it the midpoint of RU.
Therefore, statement A) RS=UT and S is the midpoint of RU is true.