Answer: c.
expanded citizenship opportunities for immigrants.
it would be yo conozco a todos los..
yo means I meaning the conjugation would have to be conozco.
for your information, a conjugation is the adaptation of a er/ir 'to be' verb, to suggest the people performing the verb.
for example..
trabajar- to work
trabajO- i work
trabajas- you work
trabaja- he/she works
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Tu because If you put Mi or mis son rojos it says my are red which dosen't really make sense. Since you put tu in front of son (plual) it would be they are red.