Explanation:

Only 1

It is also known as Supersonic Combustion Ramjet.

This statement is correct A Scramjet engine is indeed known as a Supersonic Combustion Ramjet. It is an air-breathing engine designed for high-speed atmospheric flight.

It carries oxygen but does not carry hydrogen like previous engines.

This statement is incorrect. Scramjet engines, like many other air-breathing engines, do not carry their own oxygen supply. Instead, they rely on the intake of atmospheric oxygen for combustion. However, the statement about not carrying hydrogen is not accurate. Scramjet engines can use hydrogen as fuel for combustion.

Therefore, the correct option based on the provided statements is 1 (Only 1).