Can't use "arabtex" package with this template: Option clash for package babel

Question

I am using this thesis template. I need to add some arabic text. I need to add this preamble:

\usepackage{arabtex}
\usepackage[utf8]{inputenc}
\usepackage[LFE,LAE]{fontenc}
\usepackage[arabic]{babel}

Which works for me in a simple article. But with this thesis template, it generates errors:

Option clash for package babel.

\begin{alwayssingle} on input line 166 ended by \end{abstract}. \end{abstract}

\begin{abstract} on input line 166 ended by \end{romanpages}. \end{romanpages}

\begin{romanpages} on input line 148 ended by \end{document}. \end{document}

Can you identify how to make these preamble not conflict with this template?

EDIT:

This code works in separate tex file.
\documentclass[11pt,a4paper]{report}
\usepackage{arabtex}
\usepackage[utf8]{inputenc}
\usepackage[LFE,LAE]{fontenc}
\usepackage[arabic]{babel}
\begin{document}
    \chapter{علوم الحاسوب}
    \section{تاريخ}
    \begin{otherlanguage}{arabic}
        سلام 
    \end{otherlanguage}
\end{document}

But the problems arise when I try to incorporate this in this thesis template.

Answer 1

The class file does \usepackage[greek,latin,english]{babel} (which in my opinion is not a thing a class should do).

This is such a common problem that the babel manual has a note telling you the way out. Page 6 of the manual to v3.40 says

Some classes load babel with a hardcoded language option. Sometimes, the main language could be overridden with something like that before \documentclass:

\PassOptionsToPackage{main=english}{babel}

In your case:

\PassOptionsToPackage{main=arabic}{babel}
\documentclass{ociamthesis}

and remove \usepackage[arabic]{babel}.