Answer: considered to be an offer to buy made by the agent
Step-by-step explanation:
An offer to buy simply means a proposal made by a buyer to buy an asset, and this becomes legally enforceable once the person who intends to buy the asset accepts the offer made by the seller.
In this case, the agent has contacted the existing client to know if he is interested in selling these shares and once the seller agrees, the shares will be sold at an agreed price.