Explanation:

Both statements 1&3 are correct.

• A tropical cyclone is an intense circular storm that originates over warm tropical oceans and is characterized by low atmospheric pressure, high winds, and heavy rain.
• A characteristic feature of tropical cyclones is the eye, a central region of clear skies, warm temperatures, and low atmospheric pressure.

The conditions favorable for the formation and intensification of tropical storms are:

• Large sea surface with temperature higher than 27° C.
• Presence of the Coriolis force.
• Small variations in the vertical wind speed.
• A pre-existing weak low- pressure area or low-level-cyclonic circulation.
• Upper divergence above the sea level system.

Hence option 3rd is correct.