The platelets are drifting with the blood flowing in a streamline flow through a horizontal artery as shown below. The artery is contracted in region $II$. Choose the correct statement.
- AAs the platelets enter a constriction,the platelets get squeezed closer together in the narrow region and hence the fluid pressure must rise there.
- BAs the platelets enter a constriction,pressure is lower there.
- CThe artery's cross-section area is smaller in the constriction and thus the pressure must be larger there because pressure equals the force divided by area.
- DPressure is same in all the parts of the artery.
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