which data type is 1.2e3?\nint\nsingle\nfloat\nstring

Brief Explanations:

The notation 1.2e37 is scientific - notation for a floating - point number. 'int' is for integer values without decimal parts. 'single' is not a standard Python data type (Python has float which is similar to single - precision in other languages in some ways). 'string' is for text data.

Answer:

C. float