Answer:
C) credit to Cash for $80,640.
Step-by-step explanation:
The complete journal entry should be:
Dr Investments in Bonds (Target Company) account 80,000
Dr Interest Receivable account 640
Cr Cash account 80,640
Since you are purchasing the bonds at 100, it means that your are paying face value = $80,000. Since the bond purchase includes accrued interest, you must also pay for it = $640.