A cash crop that became an important export for European colonies in Southeast Asia.*1 pointChoose

The cash crop that became an important export for European colonies in Southeast Asia was rubber.

Step 1: Identify the region - The question is asking about Southeast Asia, a region that includes countries like Malaysia, Indonesia, and Vietnam.

Step 2: Identify the time period - The question is asking about the time when these countries were European colonies, which is roughly from the 16th to the 20th century.

Step 3: Identify the cash crop - During this time period, several cash crops were important, but rubber stands out as a major export.

Step 4: Confirm the answer - Rubber was indeed a significant cash crop in Southeast Asia during the colonial period. It was used in a variety of industries, including the automotive industry, which was growing rapidly in Europe and America at the time.