The given adjacency matrix with weights represent an undirected graph as it is symmetric. Keeping the node C as root, we can design a reader freindly view as the following:
As it has be asked to chose the vertex with smallest alphabetical order, the weights of the edges are disregarded here.
With the graph in hand:
1) We start with C and choose A as next out of { A B E F} beacause it is alphabetically lowest. A is marked as visited.
2) From A onward we choose B out of {B D G} with the same reason as above and mark it as visited.
3) From B onward, we don't have any unvisited neighbour to it and hence, we backtrack to A to choose D from {D G}.
Hence, it is clear that, with the given requirements, we can not perform a depth first traversal in the given graph.
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