Which One of the Following Statements Concerning Volcanic Blocks and Bombs

Multiple Choice

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

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