Explanation:

- An offer can be made in more than one way.

- By words (oral or written): This means stating your willingness to contract directly, like saying or writing, “I offer to sell my car for $5,000.”

- By conduct: Sometimes, actions alone show intention to make an offer, like putting items on display with price tags in a store.

- Either (a) or (b): The law accepts either words or conduct as a valid way to make an offer.

- Neither (a) nor (b): This option is wrong; both are acceptable ways.

Option 3: Either (a) or (b) is the correct answer.