15. There are three kinds of RNA polymerase in eukaryotes—RNA polymerases I, II, and III. RNA polymerases I, II, and III are used, respectively, to transcribe

a. rRNA, mRNA, tRNA
b. mRNA, tRNA, rRNA
c. tRNA, mRNA, rRNA
d. tRNA, rRNA, mRNA
e. all transcribe mRNA

a. rRNA, mRNA, tRNA