Question

how have smartphones changed communication and computing? they have made communication slower. they have increased the size of personal devices. they have combined communication and computing power.

Explanation:

Smartphones are advanced mobile devices. They integrate communication functions (like calling, messaging) and computing power (running apps, processing data). They don't make communication slower (as they offer instant messaging, video calls etc. which are fast). Also, they have made personal devices more compact (not increased size).

Answer:

They have combined communication and computing power.