Sentence improvement — conditional warning and idiomatic phrasing: retain the first conditional 'If + present simple, will + base' and the standard collocation 'cross the line' in 'If you cross the line you will be disqualified.'

Given sentence
If you cross the line you will be disqualified.

Concept/Approach
This is a standard first conditional: If + present simple → will + base verb to show a real future consequence. The idiomatic sports collocation is 'cross the line' (not 'upon/on/out the line').

Why the original is best
• Tense sequence is correct: 'cross' (present) → 'will be disqualified' (future passive).• Preposition use is correct: no preposition after 'cross' when the object is 'the line'.

Eliminating options
'cross upon the line' → archaic and unidiomatic.'cross on the line' → wrong preposition.'cross out the line' → 'cross out' means delete/strike through text.

Final Answer
No improvement