Final answer:
A weaker Sing$ relative to the Brazilian Real makes exports from Asia-Pacific to Latin America more competitive due to favorable exchange rate cost adjustments, as goods priced in Sing$ become cheaper in terms of reals.
Step-by-step explanation:
When analyzing the exchange rate shifts that result in a weaker Singapore Dollar (Sing$) relative to the Brazilian Real, it is important to understand the impact on competitiveness and costs. If the Sing$ becomes weaker than the Brazilian Real, this implies that it takes more Sing$ to buy the same amount of Brazilian reals. This situation typically makes the export of goods from Singapore (or broadly from the Asia-Pacific region) to Brazil (representing Latin America) more competitive. The reason is that the goods from Singapore will appear cheaper to Brazilian buyers when priced in reals, which may stimulate demand for these exports.
Therefore, the correct answer, in this case, would be (c): make the export of footwear from Asia-Pacific plants to Latin America more competitive and give rise to negative/favorable exchange rate cost adjustments. The term 'favorable exchange rate cost adjustments' refers to the cost benefit that Asian producers experience when the value of their local currency falls relative to the currencies of their export markets, thus potentially increasing their profit margins or market share.