The prayer that has three raka'at is salatul

The prayer that consists of three rak'ahs is the Maghrib prayer.

In Islamic tradition, daily prayers are performed at designated times, and each prayer consists of a specific number of rak'ahs (units of prayer).

• Maghrib is performed just after sunset, and it uniquely consists of three rak'ahs.
• The other prayers, such as Isha, consist of four rak'ahs; Subh (Fajr) consists of two rak'ahs; and Asr also has four rak'ahs.

Therefore, among the given options, Maghrib is the only prayer that is uniquely performed with three rak'ahs.