Answer:
A, B, and C
Step-by-step explanation:
A would make the most sense because 'to the girls' is a prepositional phrase. The subject is 'they' and the verb is 'sent'. So we ask the question:
What did they send?
They sent flowers. Which is our direct object.
There is no indirect object.
B. would also make sense because 'they' is our subject and 'sent' is our verb. The prepositional phrase is 'to them'
What did they send?
They sent flowers. Which is our direct object.
There is no indirect object.
C. would also make sense because 'they' is our subject and 'sent' is our verb. Our prepositional phrase is 'on Monday'.
So, what did they send?
They sent flowers.
There is no indirect object.
D. does have an indirect object.
'They' is our subject and 'sent' is our verb.
What did they send?
Flowers
To whom?
Girls
So, They (subject) sent (verb) the girls (indirect) some flowers(direct object).
Hope this helps!