Light Chain Disease - Amyloid- Amyloid Deposits Q Step 1?

Amyloid deposits q step 1? - light chain disease - amyloid-

An autopsy of an elderly person who died in a nursing home with no known genetic diseases, shows a small amount of amyloid deposits in the heart. Do not see amyloid deposits in other institutions. There is a long history of inflammatory disease. This type of amyloid is more together, which of the following proteins?
A. amyloid protein associated with
B. amyloid protein light-chain
C. beta-amyloid protein-2
D. Beta 2-microglobulin
E. transthyretin

any help would be appreciated here ... I have no idea (only in the 2nd half in up to 1 year)