A more formal or conservative work environment usually requires business attire.
Business attire
The clothing apparel professionals wear to work is commonly referred to as business dress. The suitable business dress might differ from one organization to the next, as well as from one position to the next.
Dressing properly allows the employee to offer to people a favorable, professional picture of the company. However, whether you feel a sense of belonging or are dressed informally, important to make sure you appear nice as well as placed together will strengthen the reaction people experience.
Thus the response above i.e., "option A" is correct.
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