The musical texture that consists of a single melody without accompaniment is called: Monophony
Musical texture is how the tempo, melodic, and harmonic materials are combined in a musical composition, determining the overall quality of the sound in a piece.
There are four types of textures that appear in music ;and they are Monophony, Polyphony, Homophony, and Heterophony.
Now, in this question the correct type of texture is called Monophony because monophony is the simplest of musical textures, consisting of a melody (or "tune"), typically sung by a single singer or played by a single instrument player (e.g., a flute player) without accompanying harmony or chords. Many folk songs and traditional songs are monophonic.
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