Step 1: Understanding the Concept:
The question asks to identify the specific form of marriage in Islamic law that is for a fixed, temporary period. This requires knowledge of different forms of marriage contracts in Islam.
Step 2: Detailed Explanation:
Let's analyze the given terms:
- (A) Nikah: This is the standard, permanent marriage contract in Islam, intended to be for life.
- (B) Phasid (or Fasid): This refers to an 'irregular' marriage, which has some procedural flaw but is not completely void. It is not defined by its duration.
- (C) Mutah: This is a temporary marriage contract where the duration of the marriage and the mahr (dower) are specified in advance. At the end of the specified period, the marriage automatically dissolves without a formal divorce. This practice is primarily recognized within the Twelver Shia school of Islam.
- (D) Mubarat: This is not a form of marriage, but a form of divorce by mutual consent of the husband and wife.
Step 3: Final Answer:
Mutah marriage is the form of marriage in Islam that is temporary in nature.