[单选题]
If a material has an index of refraction of 1.50, what is thv,np, ytboa o/gb/; an 92*qgge speed of light tqg1v9 oodq9lb-0h *np3 d3ijshrough ithi*gqo-d1 q9vb9lod3n spj3 0?
A. $2.00 \times 10^{8} \; m/s$
B. $3.00 \times 10^{8} \; m/s$
C. $4.50 \times 10^{8} \; m/s$
D. $6.00 \times 10^{8} \; m/s$
