DEAR MOHAMMED,

IN MY OPINION, THE CAUSES FOR MORE ITEM WRITING FLAWS IN MULTIPLE CHOICE QUESTIONS ARE AS FOLLOWS:-

1. THE TEACHERS PERCEPTION ABOUT THE QUESTIONS AND THE EXPECTED ANSWERS.

2. THE TEACHERS INTELLECTUAL CAPABILITY TO SET THE CHOICES 

3. THE TEACHERS EDUCATIONAL AND EXPERIENCE BACKGROUND

4. THE TEACHERS INTEREST AND INDEPTH KNOWLEDGE ON THE SAID SUBJECT.

5. THE TEACHERS KEENNESS TO SIMULATE THE STUDENT'S THINKING ABILITY.

6. THE CURRICULAM OR SYLLABUS RESTRICTIONS.

ETC. ETC. 

HOPE THIS INPUT HELPS.

ALL THE BEST.

BEST REGARDS.

SEKAR GOPAL

Thanks Sekay