She is diffident ____ success. Choose the appropriate preposition -

Diffident এর পরে preposition হিসেবে about বসে।

Diffident (about something):
English Meaning: not having much confidence in yourself; not wanting to talk about yourself.
Bangla Meaning: আত্মপ্রত্যয়হীন; নিজের শক্তিতে আস্থাহীন; সংশয়ী।

Example:
- He was modest and diffident about his own success.
- She felt diffident about speaking in public.

Source: Oxford Dictionary and Accessible Dictionary