Which sentence uses the word them as an indirect object?

The tour guide took them around NASA.

Leo sent them a postcard from NASA.

Space exploration is a fascinating subject to them.

The students are at the launch site with them.

1 answer

The sentence that uses the word "them" as an indirect object is:

Leo sent them a postcard from NASA.

In this sentence, "them" is receiving the postcard, making it the indirect object of the verb "sent."