Which of the following arrangements in the sequence shown can be used to obtain a pure spectrum of white light:

• A.source slit, diverging lens, prism, diverging lens, converging lens screen
• B.source, slit diverging -lens prism, diverging lens, screen
• C.source, converging lens prism, diverging lens, screen
• D.source slit, diverging lens, converging lens, screen
• E.source slit prism diverging lens screen