The most subtle action is being wired
The message is understood but the sentence is not well written. You should write "Logos, that is the appeal of logic, consists of persuation backed up with actual observation, data, and facts". While the word Logos can be paraphrased as 'the appeal of logic', it is necessary to clarify the function of Logos in a text. With that purpose in mind, it is neccesary to separate the ideas of persuation from the paraphrase.
The correct subject-verb agreement from the answer choices below is A)is...has.
'A cake or brownies is the easiest to serve. My mom has agreed to bake this weekend.'
That sounds better than
'A cake or brownies are the easiest to serve. My mom have agreed to bake this weekend.'
'A cake or brownies is the easiest to serve. My mom have agreed to bake this weekend.'
'A cake or brownies are the easiest to serve. My mom has agreed to bake this weekend.'
Those don't make sense when you read them, hence why A) is the correct choice.
