Answer:
A.
A.Ellas mandaron el <em>regalo</em> a <u>Julia</u>.
A.Ellas mandaron el regalo a Julia.Ellas <u>se</u> <em>lo</em> mandaron.
Explanation:
They sent the <em>gift</em> to <u>Julia</u>.
They sent <em>it</em> to <u>her</u>
In 'Ellas mandaron el regalo a Julia.'
'el regalo' is the direc object
to replace it we can say 'Ellas lo mandaron a julia'
and 'a julia' is the indirect object
we can replace it by using 'le', 'Ellas le mandaron el regalo.'
if we replace both indirect and direct object we shoud use 'se' instead of 'le' for the indirect object.
'Ellas se lo mandaron'
<em>indirec object pronouns:</em>
<em>indirec object pronouns:me (a mí)</em>
<em>indirec object pronouns:me (a mí)te (a tí)</em>
<em>indirec object pronouns:me (a mí)te (a tí)le (a él o ella)</em>
<em>indirec object pronouns:me (a mí)te (a tí)le (a él o ella)nos (a nosotros)</em>
<em>indirec object pronouns:me (a mí)te (a tí)le (a él o ella)nos (a nosotros)vos (a vosotros)</em>
<em>indirec object pronouns:me (a mí)te (a tí)le (a él o ella)nos (a nosotros)vos (a vosotros)les (a ellos o ustedes)</em>
<em>indirec object pronouns:me (a mí)te (a tí)le (a él o ella)nos (a nosotros)vos (a vosotros)les (a ellos o ustedes)direc object pronouns:</em>
<em>indirec object pronouns:me (a mí)te (a tí)le (a él o ella)nos (a nosotros)vos (a vosotros)les (a ellos o ustedes)direc object pronouns:la (for femenine singular)</em>
<em>indirec object pronouns:me (a mí)te (a tí)le (a él o ella)nos (a nosotros)vos (a vosotros)les (a ellos o ustedes)direc object pronouns:la (for femenine singular)lo (for masculine singular)</em>
<em>indirec object pronouns:me (a mí)te (a tí)le (a él o ella)nos (a nosotros)vos (a vosotros)les (a ellos o ustedes)direc object pronouns:la (for femenine singular)lo (for masculine singular)las (for femenine plural)</em>
<em>indirec object pronouns:me (a mí)te (a tí)le (a él o ella)nos (a nosotros)vos (a vosotros)les (a ellos o ustedes)direc object pronouns:la (for femenine singular)lo (for masculine singular)las (for femenine plural)los (for masculine plural)</em>