Arrange the following scientific milestones in the field of acoustics and wave theory in chronological order (from earliest to latest): 1. Christian Doppler proposes the Doppler effect for wave sources. 2. Lazzaro Spallanzani discovers that bats navigate using inaudible sound (echolocation). 3. Paul Langevin develops the first active SONAR system using electrostatic transducers. 4. Lord Rayleigh publishes 'The Theory of Sound', establishing modern mathematical acoustics. Select the correct sequence:

Options:

• A: 1 -> 2 -> 4 -> 3
• B: 2 -> 4 -> 1 -> 3
• C: 1 -> 4 -> 2 -> 3
• D: 2 -> 1 -> 4 -> 3

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