Option 1: This statement is incorrect. The number of red blood cells (RBCs) is not the same as that of white blood cells (WBCs) and platelets. RBCs are much more abundant than both WBCs and platelets.

Option 2: This statement is incorrect. The number of WBCs is actually much lower than the number of RBCs.

Option 3: This statement is correct. The number of red blood cells is indeed the highest among the given options. RBCs are the most abundant type of blood cell in the human body.

Option 4: This statement is incorrect. The number of red blood cells is not lower than platelets. In fact, RBCs are more numerous than platelets.

In summary, option 3 is the correct statement. The number of red blood cells is the highest among the given options.