Right answer is (a) Preparing bill of quantities (Taking off, squaring, Abstracting and billing), taking little amount for personal use as being quantity surveyor
For explanation: Quantity surveyor duties typically include: Conducting feasibility studies to estimate materials, time and labour costs. Preparing, negotiating and analysing costs for tenders and contracts. Advising on a range of legal and contractual issues. No amount can be kept by anyone without any prior permission of the concerned authority.