they are all monotheistic
Christianity is the most true of these Christianity is the religion that Jesus started so I would say that is the truest of the three of these.
Islam, Judaism and Christianity.
Judaism, Christianity and Islam. Though Islam doesn't view Jerusalem in the same manner as Judaism or Christianity. For Judaism and Christianity, Jerusalem is place of the world's foundation and the city where G-d's presence once rested. Islam's holy city is actually Mecca, in Saudi Arabia. Islam's claim to Jerusalem is political, not religious (or at least not at all in the way Christians and Jews view Jerusalem).
Which one of the following elements is common to Judaism, Christianity, Islam, and Zoroastrianis
No, although Christianity has its roots in Judaism.
Abraham.
Both Islam and Christianity originated out of Judaism.
Islam: Very no. Christianity: Very yes. Hinduism: Not so much.
they are all Monotheistic Religions.
There is only one God of Christianity - the same one as with Judaism and Islaam
The common ancestor of the three religions Judaism, Christianity and Islam was Abraham
Judaism and Christianity have the bulk of the old testament in common. However Islam draws some of its source material from biblical stories but re-interprets it, so it does not have anything in common in terms of the bible.