Which of the following statements is most true regarding long noncoding RNAs lncRNAs ?

A)lncRNAs do not contain a 5' guanine cap or a 3' poly- A- tail.
B)Some lncRNAs will decrease the activity of miRNAs.
C)Some lncRNAs regulate alternative splicing.
D)lncRNAs are characteristically about the same size as sncRNAs.
E)lncRNAs act only as posttranscriptional regulators and never as pretranscription regulators.