Shared derived traits:.a) are shared by all organisms on the cladogram. b) are shared only by common ancestors. c) are homologies found only in certain members of the ingroup. d) are homologies found between the ingroup and the outgroup. e) are found within members of the outgroup.

Option A

Explanation:

When two lineages share common characteristics, they tend to possess a shared character.  

Within these two lineages, several organisms arise leading up to a clade. Each clade has character devised through the evolution of derived character in each lineage leading thereby differing all the clades from each other  

Shared derived characters are used to group organisms into clades. Organisms that share derived characters are reffered as cladistics or phylogenetic systematics

Hence, option A is correct