The spelling of the word "Tomassoni" can be explained using the International Phonetic Alphabet (IPA). The first syllable "To-" is pronounced as "təʊ", where the "o" sound is long. The second syllable "-mas" is pronounced as "mæs", with a short "a" sound. The final syllable "-soni" is pronounced as "sɒni", where the "o" sound is short and the stress falls on the second syllable. Therefore, the correct IPA transcription for "Tomassoni" is /təʊˈmæsɒni/.