Fill in the blank in the following sentence by choosing the correct option.
Rita ________ her seat in the class.

Correct option is A

Correct option: (a) dropped into
Meaning & why it fits (in detail):
• drop into a seat → to sit down quickly/heavily, often casually or suddenly (Hindi: झट से/धड़ाम से बैठ जाना)
• Sentence meaning: Rita quickly sat in her seat in the class.
Correct sentence: Rita dropped into her seat in the class.
Meanings of other options (in detail):
• (b) dropped off in → incorrect usage; “drop off” usually means fall asleep or deliver/leave someone somewhere (Hindi: झपकी लेना / छोड़ देना)
• (c) fell in with → to agree with; to meet by chance (Hindi: सहमत होना / अचानक मिलना)
• (d) got on with → to continue OR to have a good relationship with (Hindi: जारी रखना / बनती होना)
Hence, option (a) is the correct answer.