A thin walled spherical shell is subjected to an internal pressure. If the radius of the shell is increased by $1 \%$ and the thickness is reduced by $1 \%,$ with the internal pressure remaining the same, the percentage change in the circumferential (hoop) stress is

(A) 0

(B) 1

(C) 1.08

(D) 2.02

A thin walled spherical shell is subjected to an internal pressure. If the radius of the shell is increased by $1 \%$ and the thickness is reduced by $1 \%,$ with the internal pressure remaining the same, the percentage change in the circumferential (hoop) stress is

(A) 0

(B) 1

(C) 1.08

(D) 2.02

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