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Why is climbing a lamp post harder than climbing up a tree?

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Why is climbing a lamp post harder than climbing up a tree?

(a) Because of parallel friction force

(b) Because of contact force between the bodies

(c) Because of Van der Wall’s force

(d) Because of rope force

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I'm obligated to ask this question of Dimensional Analysis in portion Advanced Engineering Materials of Engineering Physics II

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Correct choice is (a) Because of parallel friction force

The best I can explain: Sometimes, the electromagnetic contact force between two bodies may have a component acting parallel to the surface of contact. This is called friction. When bodies are placed with their smooth surfaces in contact, they provide only a small parallel component of contact of force and hence friction between them is small. This is why climbing a metallic lamp post is difficult than climbing up a tree.

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