Answer : The correct option is, (2) lithium + oxygen to lithium oxide
Explanation :
When the lithium react with the oxygen to give lithium oxide as a product.
The balanced chemical reaction will be,

This reaction can be represented in words as,
Lithium react with oxygen to give lithium oxide.
or,
lithium + oxygen to lithium oxide
Hence, the correct option is, (2) lithium + oxygen to lithium oxide