From the information given:

Mass of crucible = 10g
Mass of crucible + soil before heating = 29g

Mass of soil before heating = 29 - 10 = 19g
Mass of a crucible + soil after heating = 18g

Mass of soil after heating = 18 - 10 = 8g

Mass of water loss = 19 - 8 = 11g

% of water loss = \(\frac{mass of water loss}{Total mass of soil}\times 100\)

 = \(\frac{11}{19}\times 100\)

 = 57.89%

From the options provided, the closest answer is 60%