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The thickest layer of the wall of an artery is the

ATunica externa with fibrous connective
BInternal lamina with collagen fibres
CTunica intima of squamous endothelium
DTunica media with muscle and elastic fibres
Answer & Solution
Correct answer: D. Tunica media with muscle and elastic fibres
Arteries have a thick tunica media (smooth muscle + elastic fibres) to withstand the high pressure of pumped blood. Veins have a much thinner tunica media. Tunica intima is the inner endothelium externa is the outer connective tissue.
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