Is request of Installment consider as counter offer?

On Sunday, 1st July 2019, A heard from his friend named N, that T, a former colleague wishes to sell his nursery business called “Chip n Munk” for 2 million. A visits the nursery and seems to be interested to purchase nursery business. T wrote a letter of offer to A on 10th July 2019 stating that “if A agrees with the offer and responds through a letter within a week, the business will be sold to him.” However, A replies and says that “he can only afford it if he could pay for it in four installments”. T does not respond. Later that day, T receives a message on Facebook from his friend, S, saying “I heard you are selling your nursery. I would like to buy it for 1.9 million.” On 16th July 2019, A sends a letter by Pos services to T accepting T offer and in the letter, he enclosed a cheque for the sum of 2 million. On the same day, T replies S message on Facebook accepting S offer and giving him instructions on the payment details. On Sunday, 17th July 2019, A heard from a mutual friend that T had sold his nursery business to S. On Monday morning of 18th July 2019, A approaches T at his nursery and asks T if he has received his letter to which T replied that he had not. T also informed A that he had sold the nursery to S for 1.9 million. A was disappointed and very furious. On returning home that evening, T finds A’s letter in his room. His wife informed him that it came by courier that afternoon. Advise A on the two matters below:
i) whether he has any action against Theodore for breach of contract;
ii) whether Theodore could revoke his acceptance.