Contains large amounts of potassium

a. nephridium

b. malpighian tubes

c. kidneys

d. none of the above

Option B, Malpighian Tubes

Explanation:

In excretory system of Arthropods, the malphigian tubules constitute to be the main excretory organs in which bicarbonates of sodium and potassium, uric acid and water are formed. These maplhigian tubules are able to reabsorb the bicarbonates of potassium and sodium and transfers them into the blood known as haemolymph. The potassium ions are pumped out from the tubule into blood by potassium ion pump

Hence, option B is correct.

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straight probes are used primarily for measuring flow as it is approaching the test area. its geometry allows the probe to be mounted so that it is in the direct line of airflow.