Which One of the Following Statements Concerning Volcanic Blocks and Bombs

Which one of the following statements concerning volcanic blocks and bombs is TRUE?

A) Bombs and blocks are both smaller than lapilli and cinders.
B) Bombs are ejected as magma lumps; blocks are ejected as solid fragments.
C) Bombs are guided to Earth by laser beams; blocks fall anywhere.
D) Blocks are broken fragments of solid rocks; bombs have smaller sizes than lapilli.