The clause <em>who bought the coat </em>is used as an adjective subordinate clause because it modifies the noun <em>the man.
</em>What man forgot his umbrella? (The one) who bought the coat.<em>
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<span>B. to highlight the need for gender equality and equal rights for women
I almost felt tempted to say "C", but the speech's central idea goes way beyond that</span>
It does because it could fall because of its size
they should go because it may be of good to them