Final answer:
The expression asinC=h in relation to the sine ratio refers to the height of the triangle, with 'a' being the hypotenuse and C being the angle opposite the height.
Step-by-step explanation:
According to the definition of a sine ratio, the expression asinC=h represents (c) Height of the triangle. The sine of an angle in a right triangle is the ratio of the length of the opposite side to the hypotenuse. Therefore, if we are given the hypotenuse (h) and the sine of angle C (sinC), multiplying these together gives us the length of the opposite side, which is the height of the triangle when angle C is one of the non-right angles.