A: 'Has/have/had' is followed by a past participle form of verb, here, it is not the case, therefore, this sentence is grammatically incorrect.
B: 'Organisations' is a plural noun so the use of singular verb 'supports' is incorrect.
Only sentence C is grammatically correct.
Hence, option (c) is correct.
NOTE:
Participle: A word formed from a verb (e.g. going, gone, being, been) and used as an adjective (e.g. working woman, burnt toast) or a noun (e.g. good breeding). In English participles are also used to make compound verb forms (e.g. is going, has been). Consider the sentences given below:
Dancing at the party, the women fell on the ground.
Encouraged by her parents, Rita went on to pursue her passion.
The highlighted word in the first sentence is of the form Verb + ing and is used as a present participle. It is used to denote an action that is going on or incomplete or imperfect.
The highlighted word in the second sentence is of the form verb + ed. It is used as a past participle. It denotes completed action or state of the thing spoken of.
A past participle ends with the following: -ed, -d, -t, -en, or -n.
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