The trip from Europe to the Indian Ocean was shortened when the British decided to create a Canal in Egypt (the Suez Canal) which allowed Europeans to reach the Indian Ocean much quicker.
As a deputy postmaster, he became interested in the North Altlantic Ocean circulation patterns. While in England, Franklin heard a question about why it took mail longer to reach than RI. He then asked his cousin who told him that merchant ships routinely avouded a strong eastbound mid-ocean current while the mail packets captain sailed dead into it, fighting an adverse current.
Answer: it was most likely carried by fleas living on the black rats that traveled on all merchant ships, spreading throughout the Mediterranean Basin and Europe
Explanation: The Black Death is thought to have originated in the dry plains of Central Asia, where it traveled along the Silk Road, reaching Crimea by 1343
The answer is C.costal plains