Final answer:
The verb in bold 'shed' is the past tense form, which indicates an action that occurred in the past and is now complete. The correct option is A. Past tense form.
Step-by-step explanation:
The verb in bold in the sentence 'Analysis of his DNA shed light on his identity.' is in the past tense form. Therefore, the correct answer is A. Past tense form. This can be determined by the context of the sentence and the fact that the action has already been completed; the analysis has already taken place and revealed information about his identity.
In English grammar, verbs play a crucial role and their conjugation helps to express when the action takes place. The form of the verb 'shed' is a regular past tense form, which indicates an action that occurred in the past and which does not continue into the present. It is not a present participle or gerund (option B), neither is it a simple present form (option C), nor an infinitive without 'to' (option D).