When someone writes something, it lasts (potentially) forever, so we can still read things that were written hundreds or even thousands of years ago, and the things written today will (potentially) still be readable in hundreds or thousands of years' time. This is what it means by sending messages "through time" (I assume).
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zerobitNone of the answers look right to me. 1 and 3 don't seem right because they are not specific to writing (note, i
To be able "to send messages through time" means to have the ability to .. .
1) talk about past, future and present
2) speak to both humans and animals
3) speak about time
4) send messages in different ways