Answer:
B made an offer to sell to the customer
Explanation:
Since in the question it is given that customer contacted the agent for purchasing the shares but there is no shares that are offered in the market so he would reach to the officer that she is able to sell some of her shares and at the same time the officer agrees and according to this he contacted to the customer
So here the agent has made the offer for selling the shares to the customer
Therefore, the option B is correct