Assertion $(A):$ The stream of water flowing at high speed from a garden hose pipe tends to spread like a fountain when held vertically up but tends to narrow down when held vertically down.
Reason $(R):$ In any steady flow of an incompressible fluid,the volume flow rate of the fluid remains constant.

• A
  If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
• B
  If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
• C
  If Assertion is true but Reason is false.
• D
  If both Assertion and Reason are false.