Which sentence from the passage is in the present tense?
a. "Some ads from Eisenhower's campaign were just reminders of the candidate's name..." (paragraph 4)
b. "But TV advertising's sophistication would soon grow quickly..." (paragraph 4)
c. "Thomas Jefferson's opponents had many negative labels for him too." (paragraph 7)
d. "Each campaign uses its war chest to buy up domain names..." (paragraph 7)
