An incompressible fluid flows over a flat plate with zero pressure gradient. The boundary layer thickness is $1 \mathrm{~mm}$ at a location where the Reynolds number is $1000 .$ If the velocity of the fluid alone is increased by a factor of $4,$ then the boundary layer thickness at the same location, in $m m$ will be

(A) 4

(B) 2

(C) 0.5

(D) 0.25

An incompressible fluid flows over a flat plate with zero pressure gradient. The boundary layer thickness is $1 \mathrm{~mm}$ at a location where the Reynolds number is $1000 .$ If the velocity of the fluid alone is increased by a factor of $4,$ then the boundary layer thickness at the same location, in $m m$ will be

(A) 4

(B) 2

(C) 0.5

(D) 0.25

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