Please answer the following question: USS Block Island (CVE-21) - USS Block Island (CVE-21/AVG-21/ACV-21) was a Bogue-class escort carrier for the United States Navy during World War II. She was the first of two escort carriers named after Block Island Sound off Rhode Island. Block Island was launched on 6 June 1942 by Seattle-Tacoma Shipbuilding Corporation of Seattle Washington under a Maritime Commission contract; sponsored by Mrs. H. B. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Mean Of Transportation