The option that expresses the given sentence in active voice is:

☀ A rare species of spiders has bitten Parker.

Explanation:

The original sentence is in the passive voice: "Parker has been bitten by a rare species of spiders." In the active voice, the subject performs the action directly. To convert it to the active voice, we need to rephrase the sentence so that the subject (a rare species of spiders) performs the action (biting).

Option 1: "A rare species of spiders had bitten Parker." - This is in the past perfect tense and does not match the original sentence's present perfect tense.

Option 2: "A rare species of spiders is biting Parker." - This is in the present continuous tense and does not match the original sentence's present perfect tense.

Option 3: "A rare species of spiders has bitten Parker." - This is the correct active voice transformation. The subject ("a rare species of spiders") is performing the action ("has bitten") on the object ("Parker").

Option 4: "A rare species of spiders bit Parker." - This is in the simple past tense and does not match the original sentence's present perfect tense.