Tayammum is performed by a Muslim when
- time of prayer has elapsed
- he wants to join a congregational prayer
-
access to water is very difficult
- he is in a hurry to perform prayer
The correct answer is: C
Explanation
Tayammum is a dry ablution in Islamic ritual purification for prayer, which involves the use of clean soil or dust when water is not available or cannot be used for reasons such as illness. Therefore, the correct answer is 'access to water is very difficult'.