Which among the following would cause the bright red colour due to bursting of crackers?

The bright crimson-red color seen during fireworks and the bursting of crackers is produced by salts of strontium (such as strontium carbonate or strontium nitrate). When energized in a flame, strontium ions emit photons predominantly at red wavelengths (~650 nm). In comparison, barium gives green, sodium gives yellow, and copper gives blue.