Which rover was the first to explore Mars?

Curiosity
Opportunity
Sojourner
Spirit
Sojourner was the first Mars rover. It was much smaller than Curiosity, whose wheel is about the size of the whole Sojourner. It landed on July 4, 1997 as part of the Mars Pathfinder mission on Mars's Ares Vallis and remained in contact with Earth till September 27, 1997.
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Answers by country

Curiosity
Opportunity
Sojourner
Spirit
answers
flagAustralia
26%
7%
53%
11%
26
flagthe Philippines
36%
9%
45%
9%
11
flagthe United States
35%
9%
43%
11%
51
flagIndia
36%
15%
38%
9%
112
flagGreece
33%
16%
33%
16%
12
flagthe United Kingdom
51%
2%
31%
14%
35
flagAustria
46%
15%
30%
7%
13
flagPoland
35%
21%
23%
19%
4347
flagGermany
44%
20%
16%
18%
54
flagPakistan
50%
8%
16%
25%
12