Usage of the word "too"

Use “too”

A. John is an engineer. George is also a mechanical engineer.
Answer : 1. John is an engineer and George is an engineer too.
2. John is an engineer and George too.

B. Debarun is going to market. Sipra is going to market.
Answer : 1. Debarun is going to market and Sipra is going too.
2. Debarun is going to market and Sipra too.

c. I can sing. I can dance.
Answer : 1. I can dance and I can sing too.
2. I can dance and sing too.

Which answer is correct and why?

Hi,

For A I suggest (1) with comma ‘an engineer, too’.

For B I wouild suggest (1) with comma '‘going, too’.

For C I would suggest (1) with comma ‘sing, too’.

Alan