Zeb is a Procurement Manager at Zig Zag Zips manufacturing.

Explanation

Carry out due diligence is the correct answer. The other answers are incorrect:

- ensure all 46 suppliers publish an Anti Slavery Statement in line with the Modern Slavery Act is wrong because the question states that some suppliers are international. The legislation is UK, meaning international suppliers don't have to do the statement. It also only applies to companies with a turnover of £36m, and some of Zeb's suppliers may be smaller than this.

- work with less suppliers to reduce the risk of slavery entering the supply chain is a silly answer be-cause Zeb probably needs all of his suppliers. There's probably a reason he uses that many.

- ask all suppliers to get Fair Trade accredited is also a silly answer. Fair Trade only exists in some industries such as cocoa and bananas. Zig Zag Zips is in manufacturing so it's probably not going to be able to fairtrade accredit some of the stuff it buys.