Blundabust Ltd finalised its financial statements for the year ended 30 June 2022. When comparing the ratio analysis for 2022 with its preceding year, which of the following may be of concern to the directors of Blundabust Ltd?

Current ratio 2021: 3 to 1; 2020: 2.5 to 1

Return on assets 2021: 18.2%; 2020: 13.9%

Inventory turnover 2021: 4.5 times; 2020: 3.6 times

Receivables turnover 2021: 5.9 times; 2020 4.2 times