Explanation:

- The transgender community has once again been let down, as the Lok Sabha passed the Transgender Persons (Protection of Rights) Bill, 2018 in great hurry amid ongoing protests over the Rafale deal.

- The Bill, ostensibly aimed at protecting transgender persons’ rights, has been drafted hastily, with no real understanding of gender identity and expression.

- This was made very clear in the original draft, with the offensive and unscientific definition of a transgender person as someone who is “neither wholly male nor wholly female”.

- After several submissions made by the transgender community and the recommendations of a parliamentary standing committee, the definition of transgender was rectified and made inclusive of diverse gender identities.

- Option 1: "for" is typically used to indicate purpose, but "aimed for" is not a common expression in this context.

- Option 2: "in" is not a suitable preposition for this context.

- Option 3: "at" is correct because "aimed at" is the correct phrase to indicate the target or focus.

- Option 4: "to" could work in some contexts, but "aimed to" is not the conventional pairing here.