Explanation:

The correct option is 1 (must bear the burden).:
The doctrine of election under the Transfer of Property Act, 1882 is based on the principle that if a person accepts the benefit of an instrument (such as a deed, will, or contract), they must also bear the corresponding burden. This means that if a person takes property or benefits under a transfer but it comes with a burden or obligation (e.g., a liability or a condition), they must accept and discharge that obligation. The doctrine ensures that no one can accept a part of a transfer while rejecting the burdens that come with it. Hence, the person must bear the burden if they accept the benefit.