The section presents a question related to chemistry, specifically focusing on the properties of elements. It asks which element has strong hygroscopic (moisture-absorbing) properties. The options provided are:

A. Calcium (Canxi)  
B. Magnesium (Magie)  
C. Silicon (Silic)  
D. Sodium chloride (Nacl)  

Key topics include hygroscopic properties of elements and the specific elements listed as options.