Which of the following contracts cannot be specifically enforced:

A contracts to sell to B a certain number of railway shares of a particular description. A refuse to complete the sale

A holds certain stocks in trust of B. A wrongfully disposes of the stock

A is a trustee of land with power to lease it for 7 years. He enters into a contract with B to grant a lease of the land for 7 years with a covenant to renew the lease at the expiry of the term