The correct answer is A only. The A arrow indicated the direction of a gradient of increasing solute concentration in the interstitial fluid surrounding a nephron. Nephron is the basic function of the kidney that is why it is important to indicate the direction of the concentration gradient in which high solute concentration may take place.
Germany had formally surrendered on November 11, 1918, and all nations had agreed to stop fighting while the terms of peace were negotiated. On June 28, 1919, Germany and the Allied Nations (including Britain, France, Italy and Russia) signed the Treaty of Versailles, formally ending the war.
