Among the listed options, candela is an SI base unit; square meter and cubic meter are derived units.

Units formed by combining base units (length, mass, time) are derived units, so 'derived units' is correct.

A sphygmomanometer is the standard instrument used to measure blood pressure.

Pascal is the SI unit of pressure/stress and is equal to N/m^2, so Nm^-2 is called the Pascal.

Displaced volume = area×depth = (3×2)×0.01 = 0.06 m³, mass of water displaced ≈0.06×1000 = 60 kg, equal to the man's mass.

Neglecting drag, the net upward force (buoyancy minus weight) remains constant, giving a constant upward acceleration.

Density is mass per unit volume, so its SI unit is kg·m^-3.

Higher volatility corresponds to a lower boiling point (and higher vapor pressure); the common stated reason is its lower boiling point.

The OCR marks option C (A·s); one coulomb equals one ampere-second.

The gravitational constant G has units m^3 kg^-1 s^-2 (often written as kg^-1 m^3 s^-2), corresponding to option C as the OCR rendered it.