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That is C. The name is not a fact about these keys: it is a description of the gaps, which is why moving the whole shape up a key renames it and changes nothing about how it sounds.
Click the keys or the staff and the chord is named from its intervals, with a slash showing the lowest note.
Music theory is two notations and a lot of naming, and people stall between what they read and what they play. The names are not arbitrary. A chord is a set of distances, and its name describes them. The block below builds a chord from either notation, names it and plays it, so a major third is something you hear.
You describe the goal in your own words and the plan asks questions back until it is one you would follow. Goals usually look like these.
There is no fixed syllabus. The plan is built around your goal and drops what it does not need. These are the topics it draws from.
Each one has its own lesson block to try.
See how it works and what it costs.