Excel macro that will send emails from outlook

[terreese]

Hello guys! I got this VBA code from a colleague which he uses when sending multiple emails from Outlook. I don't have a programming background and I would like to ask for help on how to modify it. This code sends email based from the last cell. What I would like to do is send emails to all the recipients listed in column C. Column A will be the sender and column B will be email subject. Attached is the sample file.

Sub Mail_Outlook()
Dim OutApp As Object
Dim OutMail As Object

 LastRow = ActiveSheet.Range("A" & Rows.Count).End(xlUp).Row
 
 If Cells(LastRow, 1).Value <> "" Then
 
 MailTo = Cells(LastRow, 1).Offset(0, 2).Value
       
    MailSubject = Cells(LastRow, 1).Offset(0, 1).Value
    MailBody = "Regards," & vbNewLine & vbNewLine & "Sender Name"
'Send Mail
        Set OutApp = CreateObject("Outlook.Application")
        Set OutMail = OutApp.CreateItem(o)
        With OutMail
            .Subject = MailSubject
            .To = MailTo
            .body = MailBody
            '.Attachments.Add FileNme
            .Display
            '.Send
        End With
        
        Set OutMail = Nothing
        Set OutApp = Nothing
    End If
   
End Sub