question: modern lamp from the ground, in coloured plexiglas and metal frame.
Capitalize this past sentence correctly.
A: Modern lamp from the ground, in coloured plexiglas and metal frame.

question: it has a relatively narrow channel 250 meters wide and 1400 meters long.
Capitalize this past sentence correctly.
A: It has a relatively narrow channel 250 meters wide and 1400 meters long.

question: step b: after clicking on "scan" button, the progress will be shown as below figure b.
Capitalize this past sentence correctly.
A: Step B: After clicking on "Scan" button, the progress will be shown as below figure B.