Quick question about the "-aron"/"-ieron" ending

[chanman]

The "Ustedes/Ellos/Ellas" ending for regular -ar, -er and -ir verbs is either "-aron" or "ieron", right?

I just had a quick question about the pronunciation.

For the Ustedes form of "hablar", it would be "hablaron".

Would it be pronounced like "hablarón" or "habláron"?

Just wondering that, and I usually say "hablarón" because it seems to roll off the tongue easier for me, and my Spanish teacher has never corrected me, but thinking about the general rules of Spanish pronunciation, it should be "habláron".

Thanks!