The 2011 financial statements of Willamette Valley Vineyards include the following footnote:

Note 4: Property and Equipment

20112010

Construction in progress$ 333,162$ 152,039

Land2,610,374 2,608,960

Winery building and hospitality center 6,727,419 5,516,343

Equipment6,347,4356,030,706

16,018,39014,308,048

Less accumulated depreciation(8,717,653)(8,064,058)

$7,300,737$6,243,990

Depreciation expense $671,359$ 646,155

The average useful life of Willamettes depreciable assets at the end of fiscal 2011 is:

A)9.8 years

B)10.4 years

C)16.6 years

D)19.5 years

E)None of the above.