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
Correct answer is C
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'.