Identify the entire verb phrase.

Both matches were finally won by the Wong twins.

A - - - were

B - - - won

C - - - were won

D - - - were finally won

According to some models the entire verb phrase could actually be "were finally won by the Wong twins"

But in a more restricted sense, the verb phrase includes all the verbal forms in the phrase. Here it's "were" and "won" - the correct answer is C - - - were won