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.

after the signature of the treaty of versailles in june 1919, germany lost nearly 25,000 square miles and a population of 7 million people. these territories included eupen-malmedy area and moresnet which were ceded to belgium. regarding relations with france, germany ceded the sovereignty of the saar coal mines to this country, as well as the provinces of alsace-lorraine.

explanation: