The correct answer is: 105 Pa.
One bar is equal to 100,000 pascals (Pa). A pascal is a unit of pressure or stress in the International System of Units (SI). It is defined as one newton per square meter (N/m2).
The other options are incorrect because they do not represent the correct value of one bar in pascals.
Option A: 103 Pa is equal to 100 pascals. This is incorrect because one bar is equal to 100,000 pascals, not 100 pascals.
Option B: 106 Pa is equal to 1 million pascals. This is incorrect because one bar is equal to 100,000 pascals, not 1 million pascals.
Option C: 105 Pa is equal to 100,000 pascals. This is the correct answer because one bar is equal to 100,000 pascals.
Option D: 104 Pa is equal to 10,000 pascals. This is incorrect because one bar is equal to 100,000 pascals, not 10,000 pascals.