Answer:
The correct answer is C. The border between California and Oregon is a thin, black line; this indicates a state boundary.
Explanation:
According to the map and its conventions, the correct option is C. because the line that divides the states of Oregon and California in the west of the country is a thin line that according to the conventions of the map indicates a "State Boundary". Additionally, the other options are not correct, for example, option A. "The border between Texas and Mexico is a thin, black line; this indicates an international boundary" is incorrect because according to the conventions of the map, the "National Boundary" is indicated by two thick and continuous lines; in addition, option B. "The border between California and Oregon is a blue line; this indicates an international boundary" is incorrect because the state limit between Oregon and California is not a State River Boundary; finally, option D. "The border between Texas and Mexico is a thick, black line; this indicates a state boundary" is incorrect because the boundary between Mexico and Texas is an national boundary. So, the correct aswer is C. The border between California and Oregon is a thin, black line; this indicates a state boundary.
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