Introns contain useful information

A. that will be translated exons contain useful information
B. that will be translated introns contain useful information
C. that will be transcribed exons contain useful information
D. that will be transcribed exons and introns contain useful information
E. that will be translated

Explanation:

Splicing is the post transcriptional modification of pre mRNA which occurs in nucleus just after transcription but before the RNA moves to the cytoplasm

In RNA splicing non coding regions of pre mRNA called introns are removed and coding regions called exons are religated

Removal of every intron require two transesterification reaction:

First transesterification reaction displaces exon from intron with 3' OH group

Second transesterification reaction always catalysed by 3'OH group of displaced exon at 3'splice site

Explanation:

Gene contains exons and introns. Both  exons as well as are transcribed into pre-mRNA by transcription. But through  RNA splicing, all the  introns are removed from the pre-mRNA in the form of a lariat, and exons are joined together to form a mRNA.  

RNA Splicing: it  is the process of removal of introns  from the pre-mRNA and addition of exons to form a mature mRNA. It  may produce various type of mRNA form a single gene by alternative splicing.

Finally the mature mRNA is translated into protein.

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explanation: