In which sentence is the plural possessive of singer formed correctly?

a.
those singers microphones are clipped to their shirts.

b.
those singers’ microphones are clipped to their shirts.

c.
those singer's microphones are clipped to their shirts.

d.
those singers’s microphones are clipped to their shirts.

Before tuberculosis was understood to be a communicable disease, and before the discovery of antibiotics to treat it, a major outbreak could kill or cripple a significant portion of a nation’s labor force. how would such an event affect the economy? illustrate the effect by dragging to shift either the aggregate demand curve or the long-run aggregate supply curve.

What were some passive/non-direct ways that enslaved africans did to resist slavery?

Which of the following policies can the government use to encourage entrepreneurship?