What should Sharon negotiate to ensure she has the right to renew her lease or leave if the business does not perform well?

To ensure she has the right to renew her lease or leave if the business does not perform well, Sharon should negotiate a lease option. A lease option provides flexibility by allowing the tenant the right to extend the lease for an additional term under predetermined conditions. This is beneficial in a business context where performance may fluctuate, as it gives Sharon the opportunity to reassess the situation and decide whether to continue her lease based on the business's performance.

This option serves to protect the tenant from being locked into a lease that's no longer viable, especially if the business does not meet its expected performance. It allows for strategic planning and helps in making informed decisions about the future of the business without the fear of immediate lease obligations.

The other choices, while related to lease agreements, do not provide the same level of flexibility. A termination clause might allow for ending a lease under specific conditions but doesn't inherently grant the right to renew. A fixed lease agreement specifies a set period without options for during or after the term. A security deposit provides protection against damages but does not impact lease duration or renewal terms. Therefore, negotiating a lease option is the most appropriate choice for Sharon's needs.