Concept:The recognised sources of Shari'ah are the Qur'an, Sunnah, Ijma', and Qiyas, in that order.
Explanation:The first source is the Qur'an, the revealed book of Allah.
The second source is the Sunnah, the practice and sayings of Prophet Muhammad (SAW).
The third source is Ijma', the consensus of Islamic scholars.
The fourth source is Qiyas, which is analogical reasoning applied to new cases.
Ijtihad is a broader effort of independent reasoning, but it is not counted as the fourth source.
Therefore, among the given options, the correct fourth source is Qiyas.
Answer:D. Qiyas