In a life time a person ( about a year looking for things they have lost. the things that people ( most frequently are umbrellas, keys, bags and mobile phones. most public transports have a lost and found office, where objects that(c) behind on trains or in buses are kept until their owners (. london’s lost property office deals with about 130,000 items a year.

i just want the answer for option c , whether it is have left behind or had left behind along with the reason for the same

For C, it ought to be Where objects that were left behind.

Explanation:

Objects is plural and should be accompanied by "were" in this sentence. It's talking in past tense.

Objects that have left behind is a no no for me, same as a had left behind.

If you still confuse, seek me.

PeAcE.

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