The spelling of the word "Bengston" can be explained using the International Phonetic Alphabet (IPA) transcription system. The first syllable "Beng" is pronounced as /bɛŋ/, where the "e" sounds like the "e" in "bed" and the "ŋ" is pronounced as the "ng" in "sing". The second syllable "ston" is pronounced as /stɑn/, where the "a" sounds like the "a" in "father" and the "n" is pronounced as the "n" in "new". Therefore, the correct spelling of this word is "Bengston".