A worker is combining two chemicals used in a photography lab. Chemical R costs $0.17 per gram. Chemical T costs $0.32 per gram. The worker must make a batch of the two chemicals that costs less than $24.00. Which inequality models the situation, where is the number of grams of chemical R and is the number of grams of chemical T?

A. 0.17 r + 0.32 t < 24

B. 0.32 r + 0.17 t < 24

C. 0.17 r + 0.32 t > 24

D. 0.32 r + 0.17 t > 24