If Humans Had Been Present to Build Log Structures During

Multiple Choice

If humans had been present to build log structures during the Carboniferous period (they weren't) , which plant types would have been suitable sources of logs?

A) whisk ferns and epiphytes
B) horsetails and bryophytes
C) lycophytes and bryophytes
D) ferns, horsetails, and lycophytes
E) charophytes, bryophytes, and gymnosperms