You can do this:

ICriteria query = repo.QueryAlias("a");

Conjunction condition = Restrictions.Conjunction(); //Conjunction for
AND, Disjunction for OR

if (options.Option1) {
    condition.Add(Restrictions.Eq("Prop", 1));
}

if (options.Option2) {
    condition.Add(Restrictions.Eq("Prop", 1));
}

if (options.Option3) {
    query.Add(
        Restrictions.Or(
            Restrictions.Eq("Prop2, 1),
            condition
        )
    )
} else {

    query.Add(condition);
}

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