Identify the solution set of the inequality using the given replacement set.

x < –7; {–15, –10.5, –7.2, –7, 0, 6}

a.
{–15, –10.5, –7.2, –7}

b.
{–15, –10.5, –7.2}

c.
{–15, –10.5, 0, 6}

d.
{0, 6}