The first heart sound is

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(C) The first heart sound,known as '$Lubb$',is produced by the closure of the atrioventricular $(AV)$ valves (tricuspid and bicuspid valves).This even

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'Lubb' sound at the beginning of systole

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(C) The first heart sound,known as '$Lubb$',is produced by the closure of the atrioventricular $(AV)$ valves (tricuspid and bicuspid valves).This event occurs at the beginning of ventricular systole when the ventricles start to contract,causing the pressure to rise and forcing the $AV$ valves to close to prevent backflow of blood into the atria.The second heart sound,'$Dub$',is associated with the closure of the semilunar valves at the end of ventricular systole.

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