Correct Answer: Leonine

Solution : The correct choice is the first option.

Leonine means relating to, suggestive of, or resembling a lion. As per the sentence, this word refers to a lion-like structure, making it the perfect one-word substitute.

The meanings of the other words are:

• Feline: It means connected with an animal of the cat family, like a cat.
• Porcine : It means affecting or resembling a pig or pigs.
• Lionise: It means to give a lot of public attention and approval to someone and treat them as celebrities.

Therefore, the correct answer is leonine .