Step 1: Identify the tense.
The sentence "Yamini is driving the jeep" is in Present Continuous tense.
Step 2: Passive form of Present Continuous.
Active: Subject + is/are + verb(ing) + object.
Passive: Object + is/are + being + past participle + by + subject.
Step 3: Apply the rule.
"The jeep is being driven by Yamini."
Step 4: Eliminate incorrect options.
(A) is incomplete, (C) changes tense, (D) changes meaning. Hence, only (B) is correct.