Rank the below investment instruments based on their generally perceived, i$.$e$.$ long term risk level

$($from the riskiest to the less risky$)$ for a US investor.

a$.$ US Government bonds

b$.$ US Small$-$cap stocks

c$.$ Emerging market stocks

d$.$ Emerging market government bonds

e$.$ US Large$-$cap stocks

f$.$ Emerging market corporate bonds

g$.$ US Corporate bonds