Pepsi
vinegar
orange juice
what property do all three of these common household substances have in common?
a) they are all acidic.
b) they all taste bitter.
c) they all have a ph above 7.
d) they all turn litmus paper blue.

Let's eliminate some answers.
Pepsi, vinegar, and orange juice all have acidic qualities. A looks like a true statement.
Bases tend to taste bitter, and since these substances are all acidic, B is not correct.
A pH above 7 is the definition of a basic substance, and, again, these are all acidic substances. C is incorrect
Litmus paper turns blue for basic substances, eliminating D
A is the correct answer

Thermohaline circulation and gyres