1. It is ionic molecule
2. CsI3​→Cs++I3​− 
3. Cs cannot show +3 oxidation state. Hence opt 'B' is correct

Explanation:

The correct statement for the molecule Csl3 is that it contains Cs+ and I3- ions.

Covalent Molecule:
A covalent molecule is formed when two or more non-metal atoms share electrons to form bonds. In covalent bonds, electrons are shared between atoms, resulting in a molecule with a definite structure. Csl3 does not fit this description, as it does not consist of non-metal atoms sharing electrons.

Ion Composition:
Csl3 is composed of a cation, Cs+, and an anion, I3-. The cation, Cs+, is formed from the metal atom cesium (Cs) losing one electron and acquiring a positive charge. The anion, I3-, is formed from three iodine atoms (I) gaining one electron each and acquiring a negative charge. The overall formula of Csl3 indicates that there are three iodine ions for every cesium ion, resulting in a neutral compound.

Cs3 and I- Ions:
The statement that Csl3 contains Cs3 and I- ions is incorrect. Cs3 would indicate the presence of three cesium ions, which is not the case for Csl3. The correct formula for Csl3 only includes one cesium ion, Cs+. Similarly, I- would indicate the presence of a single iodine ion, which is also not the case for Csl3. The correct formula for the anion in Csl3 is I3-, indicating the presence of three iodine ions.

Lattice I2 Molecule:
The statement that Csl3 contains lattice I2 molecules is incorrect. Lattice refers to a regular arrangement of ions in a crystal structure. I2 molecules, on the other hand, consist of two iodine atoms covalently bonded together. Csl3 does not contain I2 molecules; instead, it consists of Cs+ and I3- ions arranged in a crystal lattice structure.

Conclusion:
In conclusion, the correct statement for the molecule Csl3 is that it contains Cs+ and I3- ions. Csl3 does not form a covalent molecule, does not contain Cs3 ions, and does not consist of lattice I2 molecules.