Which of the following bonds would have the highest default risk?

A$)$ municipal bonds

B$)$ investment$-$grade bonds

C$)$ U$.$S$.$ Treasury bonds

D$)$ junk bonds

is the field of study that applies concepts from social sciences such as psychology and sociology to help understand the behavior of securities prices.

A$)$ Behavioral finance

B$)$ Strategical finance

C$)$ Methodical finance

D$)$ Procedural finance