In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.
I have written (a)/ a letter for the issue (b)/ of sports equipments. (c)/ No error (d)
The Roman Church of Catholics (a) / is one of the (b) / precious institutions. (c) / No error (d)