Characters in a tragedy typically make ethical choices

What do scholars know for certain about Jan van Eyck's Double Portrait of A Giovanni Arnolfini and his Wife (Fig. 19-1)?

A. the work celebrates the couple's wedding B. the couple was quite wealthy C. the couple's identity D. the painting originally hung in the couple's home

A noteworthy feature of this work is this inclusion of?

a) concluding sections that engage in intricate hocket b) concluding sections set the words "fa-la-la" c) concluding sections featuring a great deal of chromaticism d) concluding sections featuring long melismas on the word "amen"