The Correct Answer is Option C: break unlawfully

Explanation:
When it comes to trespassing a gate, there are several actions that can be considered as trespassing. In this case, the answer option 'C' - break unlawfully, is the correct choice. Let's break down the options and explain why 'C' is the correct answer.

a) Cross without permission:
Crossing a gate without permission can be considered trespassing. However, it does not necessarily involve breaking any laws or rules. It could simply be crossing a gate without the owner's or authority's knowledge or consent. While it may be frowned upon, it may not result in a fine.

b) Climb up and cross over:
Climbing up and crossing over a gate without permission is a more deliberate act of trespassing. It involves physically overcoming the barrier of the gate to gain unauthorized access. While this action is certainly more intrusive, it may still not necessarily involve breaking any specific laws or rules.

c) Break unlawfully:
Breaking unlawfully refers to forcibly entering or accessing a property, often by damaging or destroying physical barriers such as gates. This action is considered a clear violation of the law and typically results in fines or legal consequences. Breaking unlawfully involves intentionally disregarding the rules and regulations set forth by the owner or authority governing the property.

d) Pass on:
Passing on refers to simply moving past or going through a gate without necessarily trespassing or violating any rules. It could be a situation where the gate is open or where there is a designated pathway for individuals to pass through without restriction.

e) Pass by:
Passing by a gate typically means walking or traveling near the gate without any intention of entering or trespassing. It does not involve crossing the gate or violating any rules.

In Conclusion:
Out of the given options, option 'C' - break unlawfully, is the most appropriate choice when it comes to trespassing a gate. It signifies a deliberate act of unlawfully entering a property by damaging or destroying physical barriers such as gates. This action is considered a violation of the law and may result in fines or legal consequences.