var ss = SpreadsheetApp.getActiveSpreadsheet();
var vJOresponses = ss.getSheetByName("Responses");
var vCodesDay = ss.getSheetByName("Codes")
var vLength = vJOresponses.getRange("C2").getValue();
var vResults = vJOresponses.getRange("D2").getValue();
var vemailAddresses = vJOresponses.getRange("B2").getValue();
var vsubject = "Here are your Wi-Fi codes!";
var dataRangeDay = vCodesDay.getSheetValues(1, 1, vResults, 1);

MailApp.sendEmail(vemailAddresses, vsubject, dataRangeDay)