In the Question Above, A, B and C Agreed to Use

In the question above, A, B and C agreed to use the amount of ₱100M left by their parents for the development of the land. D disagreed. Is D's act correct?

A) No, because it is prejudicial to the interest of the co-ownership.
B) Yes, because the expenditure is not a mere act of administration, but an act of dominion.
C) Yes, because the expenditure is not a mere act of administration but an act of dominion which needs the consent of all.
D) No, because being trustees of one another, they are presumed to act favorably for every co-owner.