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The number of articulation points of the following graph is

1. 0
2. 1
3. 2
4. 3

ARTICULATION POINT: are those points whose removal from the graph makes the graph disconnected.

here if we remove the vertex no. $2$ than we get disconnected graph.

similarly if we remove the vertex no. $3$ than we get disconnected graph.

similarly if we remove the vertex no. $5$ than we get disconnected graph.

So, D choice.

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vertex 1 is not cut vertex because if we remove it from a graph, a graph is still connected

The articulation points are 2,3,5.