Final answer:
The correct format for an address in written English is option a), which uses commas to separate each part of the address for better readability.
Step-by-step explanation:
The correct way to format an address in written English is to include commas to separate the different parts of the address. Thus, the correct sentence is:
a) The taxi is taking me to 14 Sesame Street, Chicago, Illinois, 01234.
This sentence correctly uses commas to separate the street address from the city, and the city from the state and ZIP code. Commas help to clarify the separation of each part of the address for better readability. Options b), c), and d) are missing necessary punctuation that is needed when writing an address as per standard English grammar.