The statement that the Iroquois wanted to join forces with the Algonquins and Hurons, who were also fighting with the British, is not a reason for the Iroquois to align with the British. In fact, the Iroquois had longstanding rivalries with the Algonquin and Huron tribes, who typically allied with the French. The Iroquois preferred to side with the British during conflicts such as the French and Indian War largely due to their existing rivalries with these tribes and other strategic interests.
The other reasons provided, such as lower prices offered by the British traders and their prior trading relationships, are more aligned with the motivations for the Iroquois to support the British. Thus, the first statement about their desire to join forces with the Algonquins and Hurons is the correct answer to your question.