Which of the following straits is on the dividing line between Asia and Africa?

The Bab-el-Mandeb, also known as “the Gate of Grief”, is a strait between Yemen on the Arabian Peninsula, Asia, and Djibouti and Eritrea in the Horn of Africa. It connects the Red Sea to the Gulf of Aden.

In "Bab-el-Mandeb", "Bab" refers to "gate" while "Mandeb" refers to "lamentation" or "grief".

The Bab-el-Mandeb acts as a strategic link between the Indian Ocean and the Mediterranean Sea via the Red Sea and the Suez Canal. Most exports of petroleum and natural gas from the Persian Gulf that transit the Suez Canal or the SUMED Pipeline pass through both the Bab-el-Mandeb and the Strait of Hormuz. In 2018, an estimated 6.2 million barrels per day (b/d) of crude oil, condensate, and refined petroleum products flowed through the Bab-el-Mandeb Strait toward Europe, the United States, and Asia, which accounted for about 9% of total seaborne-traded petroleum all over the world.

Chokepoints are narrow channels along widely used global sea routes that are critical to global energy security. The Bab-el-Mandeb Strait is 18 miles wide at its narrowest point, limiting tanker traffic to two 2-mile-wide channels for inbound and outbound shipments.

Closure of the Bab-el-Mandeb Strait could keep tankers originating in the Persian Gulf from transiting the Suez Canal or reaching the SUMED Pipeline, forcing them to divert around the southern tip of Africa, which would increase transit time and shipping costs.