Francis Acana is comparing the property and equipment disclosures for three airline companies, as summarized in the following table:

Airline A

Aiding B

Airline C

Historical cost, aircraft

$17,239

£23,584

45,266

Accumulated depreciation aircraft

6,584

13,654

21,745

Net cost, aircraft

10,655

9,930

23,521

Annual depreciation expense

575

786

1,509

Acana finds that the average fleet age is

a. lowest for Airline A.

b. lowest for Airline B.

c. lowest for Airline C.