Which of the following language is not supported by Spark?

Answer: Option B

Apache Spark is a powerful open-source processing engine for big data analytics and supports multiple programming languages.

Option A: Java - This is supported by Spark. Spark has a comprehensive API for Java.

Option B: Pascal - This is not supported by Spark. Pascal is not one of the languages for which Spark provides APIs.

Option C: Scala - This is supported by Spark. Spark is written in Scala and provides a robust API for it.

Option D: Python - This is supported by Spark. Spark has a popular API for Python known as PySpark.

Therefore, the correct answer is Option B: Pascal.