What causes the scent to develop in the aromatic resinous wood known as agarwood, or aloeswood?

Question

AA highly acid soil

BA particularly long drought

CFungus or bacteria

DClose association with Macaranga plants and Crematogaster ants tending Coccus scale insects

Select from the options above.

Correct Option: 3  

Explanation:
Fungus or bacteria
The scented oil in the resin in some species in the genus Aquilaria, large evergreen trees native to southeast Asia, forms as a protective secretion round areas in a tree invaded by bacteria or fungus, sometimes as a result of penetration by the Ambrosia Beetle. The affected wood, also known as oud, is a highly prized perfume either as the wood for burning or incense, or as an oil.