If humans had been present to build log structures during the carboniferous period (they were not), which plant types would have been suitable sources of logs?

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

c is the correct answer hope this !

you can have just about every answer you can think of