The answer is: B. Typewriter
A piano is a musical instrument played using a keyboard. It is a member of the chordophone family, which also includes the guitar, harp, and harpsichord. The piano is a stringed instrument, and the sound is produced by striking the strings with felt-covered hammers.
A typewriter is a mechanical or electromechanical machine for writing characters on paper by striking them with a series of keys. The keys strike a ribbon with ink, which then prints the character onto the paper. Typewriters were once widely used, but they have been largely replaced by computers.
A computer is an electronic device that can be programmed to carry out sequences of arithmetic or logical operations automatically. Modern computers can perform generic sets of operations known as programs. These programs enable computers to perform a wide range of tasks.
A calculator is a small electronic device that is used to perform arithmetic calculations. Calculators are typically used for simple calculations, such as addition, subtraction, multiplication, and division. However, some calculators can also perform more complex calculations, such as trigonometric functions and logarithms.
The word that is different from the rest is “typewriter”. This is because the other three words are all electronic devices, while a typewriter is a mechanical device.