It is defining.
Defining relative clause does not have a comma, while a non-defining relative clause has.
For example, if the sentence is:
The children, who hate chocolates, are uncommon.
- since there is comma in this sentence, it is non-defining.
- while if there is no comma like the question in the picture, it is defining.
The answer could actually be "climb" or "was climbing," but traditionally should be "climb." Hope this helps :)
The answer is C - Similarities and differences
You gotta read the esssay tha all
